build: bump uglifyjs-webpack-plugin from 1.2.3 to 1.2.4

Bumps [uglifyjs-webpack-plugin](https://github.com/webpack-contrib/uglifyjs-webpack-plugin) from 1.2.3 to 1.2.4.
- [Release notes](https://github.com/webpack-contrib/uglifyjs-webpack-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/uglifyjs-webpack-plugin/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/uglifyjs-webpack-plugin@v1.2.3...v1.2.4)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Author: dependabot-support

package.json

@@ -134,7 +134,7 @@
     "sinon": "4.4.6",
     "style-loader": "0.20.3",
     "uglify-js": "3.3.15",
-    "uglifyjs-webpack-plugin": "1.2.3",
+    "uglifyjs-webpack-plugin": "1.2.4",
     "webpack": "3.11.0",
     "webpack-dev-server": "2.11.1"
   },

yarn.lock

@@ -2468,15 +2468,15 @@ concat-map@0.0.1:
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/concat-map/-/concat-map-0.0.1.tgz#d8a96bd77fd68df7793a73036a3ba0d5405d477b"
 
-concat-stream@^1.4.1, concat-stream@^1.5.0:
+concat-stream@^1.4.1:
   version "1.6.0"
   resolved "https://registry.yarnpkg.com/concat-stream/-/concat-stream-1.6.0.tgz#0aac662fd52be78964d5532f694784e70110acf7"
   dependencies:
     inherits "^2.0.3"
     readable-stream "^2.2.2"
     typedarray "^0.0.6"
 
-concat-stream@^1.6.0:
+concat-stream@^1.5.0, concat-stream@^1.6.0:
   version "1.6.1"
   resolved "https://registry.yarnpkg.com/concat-stream/-/concat-stream-1.6.1.tgz#261b8f518301f1d834e36342b9fea095d2620a26"
   dependencies:
@@ -3152,8 +3152,8 @@ duplexer2@^0.1.2, duplexer2@~0.1.0, duplexer2@~0.1.2:
     readable-stream "^2.0.2"
 
 duplexify@^3.4.2, duplexify@^3.5.3:
-  version "3.5.3"
-  resolved "https://registry.yarnpkg.com/duplexify/-/duplexify-3.5.3.tgz#8b5818800df92fd0125b27ab896491912858243e"
+  version "3.5.4"
+  resolved "https://registry.yarnpkg.com/duplexify/-/duplexify-3.5.4.tgz#4bb46c1796eabebeec4ca9a2e66b808cb7a3d8b4"
   dependencies:
     end-of-stream "^1.0.0"
     inherits "^2.0.1"
@@ -6319,20 +6319,13 @@ lru-cache@2.2.x:
   version "2.2.4"
   resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-2.2.4.tgz#6c658619becf14031d0d0b594b16042ce4dc063d"
 
-lru-cache@^4.0.1:
+lru-cache@^4.0.1, lru-cache@^4.1.1:
   version "4.1.2"
   resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-4.1.2.tgz#45234b2e6e2f2b33da125624c4664929a0224c3f"
   dependencies:
     pseudomap "^1.0.2"
     yallist "^2.1.2"
 
-lru-cache@^4.1.1:
-  version "4.1.1"
-  resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-4.1.1.tgz#622e32e82488b49279114a4f9ecf45e7cd6bba55"
-  dependencies:
-    pseudomap "^1.0.2"
-    yallist "^2.1.2"
-
 lru-cache@~2.6.5:
   version "2.6.5"
   resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-2.6.5.tgz#e56d6354148ede8d7707b58d143220fd08df0fd5"
@@ -8522,9 +8515,9 @@ read-pkg@^2.0.0:
     normalize-package-data "^2.3.2"
     path-type "^2.0.0"
 
-"readable-stream@1 || 2", readable-stream@2, readable-stream@^2.0.0, readable-stream@^2.0.1, readable-stream@^2.0.2, readable-stream@^2.0.4, readable-stream@^2.0.5, readable-stream@^2.0.6, readable-stream@^2.1.4, readable-stream@^2.2.6, readable-stream@^2.2.9, readable-stream@^2.3.0:
-  version "2.3.4"
-  resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.3.4.tgz#c946c3f47fa7d8eabc0b6150f4a12f69a4574071"
+"readable-stream@1 || 2", readable-stream@^2.0.0, readable-stream@^2.0.4, readable-stream@^2.1.5, readable-stream@^2.2.2, readable-stream@^2.3.5:
+  version "2.3.5"
+  resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.3.5.tgz#b4f85003a938cbb6ecbce2a124fb1012bd1a838d"
   dependencies:
     core-util-is "~1.0.0"
     inherits "~2.0.3"
@@ -8543,9 +8536,9 @@ readable-stream@1.1.x:
     isarray "0.0.1"
     string_decoder "~0.10.x"
 
-readable-stream@^2.1.5, readable-stream@^2.2.2, readable-stream@^2.3.5:
-  version "2.3.5"
-  resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.3.5.tgz#b4f85003a938cbb6ecbce2a124fb1012bd1a838d"
+readable-stream@2, readable-stream@^2.0.1, readable-stream@^2.0.2, readable-stream@^2.0.5, readable-stream@^2.0.6, readable-stream@^2.1.4, readable-stream@^2.2.6, readable-stream@^2.2.9, readable-stream@^2.3.0:
+  version "2.3.4"
+  resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.3.4.tgz#c946c3f47fa7d8eabc0b6150f4a12f69a4574071"
   dependencies:
     core-util-is "~1.0.0"
     inherits "~2.0.3"
@@ -9592,8 +9585,8 @@ sshpk@^1.7.0:
     tweetnacl "~0.14.0"
 
 ssri@^5.2.4:
-  version "5.2.4"
-  resolved "https://registry.yarnpkg.com/ssri/-/ssri-5.2.4.tgz#9985e14041e65fc397af96542be35724ac11da52"
+  version "5.3.0"
+  resolved "https://registry.yarnpkg.com/ssri/-/ssri-5.3.0.tgz#ba3872c9c6d33a0704a7d71ff045e5ec48999d06"
   dependencies:
     safe-buffer "^5.1.1"
 
@@ -10156,9 +10149,9 @@ uglify-to-browserify@~1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/uglify-to-browserify/-/uglify-to-browserify-1.0.2.tgz#6e0924d6bda6b5afe349e39a6d632850a0f882b7"
 
-uglifyjs-webpack-plugin@1.2.3:
-  version "1.2.3"
-  resolved "https://registry.yarnpkg.com/uglifyjs-webpack-plugin/-/uglifyjs-webpack-plugin-1.2.3.tgz#bf23197b37a8fc953fecfbcbab66e506f9a0ae72"
+uglifyjs-webpack-plugin@1.2.4:
+  version "1.2.4"
+  resolved "https://registry.yarnpkg.com/uglifyjs-webpack-plugin/-/uglifyjs-webpack-plugin-1.2.4.tgz#5eec941b2e9b8538be0a20fc6eda25b14c7c1043"
   dependencies:
     cacache "^10.0.4"
     find-cache-dir "^1.0.0"
@@ -10582,11 +10575,10 @@ wordwrap@~0.0.2:
   resolved "https://registry.yarnpkg.com/wordwrap/-/wordwrap-0.0.3.tgz#a3d5da6cd5c0bc0008d37234bbaf1bed63059107"
 
 worker-farm@^1.5.2:
-  version "1.5.4"
-  resolved "https://registry.yarnpkg.com/worker-farm/-/worker-farm-1.5.4.tgz#4debbe46b40edefcc717ebde74a90b1ae1e909a1"
+  version "1.6.0"
+  resolved "https://registry.yarnpkg.com/worker-farm/-/worker-farm-1.6.0.tgz#aecc405976fab5a95526180846f0dba288f3a4a0"
   dependencies:
     errno "~0.1.7"
-    xtend "~4.0.1"
 
 wrap-ansi@^2.0.0:
   version "2.1.0"