bump dependencies and remove unused ones

package.json

@@ -89,7 +89,7 @@
     "babel-code-frame": "^6.7.5",
     "babel-core": "^6.3.21",
     "babel-plugin-ava-throws-helper": "^0.1.0",
-    "babel-plugin-detective": "^1.0.2",
+    "babel-plugin-detective": "^2.0.0",
     "babel-plugin-espower": "^2.2.0",
     "babel-plugin-transform-runtime": "^6.3.13",
     "babel-preset-es2015": "^6.3.13",
@@ -113,7 +113,6 @@
     "figures": "^1.4.0",
     "find-cache-dir": "^0.1.1",
     "fn-name": "^2.0.0",
-    "globby": "^5.0.0",
     "has-flag": "^2.0.0",
     "ignore-by-default": "^1.0.0",
     "is-ci": "^1.0.7",
@@ -130,7 +129,6 @@
     "md5-hex": "^1.2.0",
     "meow": "^3.7.0",
     "ms": "^0.7.1",
-    "multimatch": "^2.1.0",
     "not-so-shallow": "^0.1.3",
     "object-assign": "^4.0.1",
     "observable-to-promise": "^0.4.0",
@@ -146,7 +144,6 @@
     "require-precompiled": "^0.1.0",
     "resolve-cwd": "^1.0.0",
     "set-immediate-shim": "^1.0.1",
-    "slash": "^1.0.0",
     "source-map-support": "^0.4.0",
     "stack-utils": "^0.4.0",
     "strip-ansi": "^3.0.1",
@@ -168,17 +165,17 @@
     "inquirer": "^1.0.2",
     "lolex": "^1.4.0",
     "mkdirp": "^0.5.1",
-    "nyc": "^6.0.0",
+    "nyc": "^7.1.0",
     "pify": "^2.3.0",
     "proxyquire": "^1.7.4",
     "rimraf": "^2.5.0",
     "signal-exit": "^3.0.0",
     "sinon": "^1.17.2",
     "source-map-fixtures": "^2.1.0",
-    "tap": "^5.4.2",
+    "tap": "^6.3.0",
     "touch": "^1.0.0",
     "xo": "*",
-    "zen-observable": "^0.2.1"
+    "zen-observable": "^0.3.0"
   },
   "xo": {
     "rules": {