feat(angular): Drop Angular v4 support, add Angular v6 support

BREAKING CHANGE: RxJS v6 and Angular v5 or higher is now required to use this package.

If using Angular v5, you should update to `"rxjs": "^6.0.0"` and also add `"rxjs-compat": "^6.0.0"`.

Author: Matt Lewis

package.json

@@ -17,23 +17,23 @@
   },
   "license": "MIT",
   "dependencies": {
-    "@uirouter/angular": "1.1.0",
+    "@uirouter/angular": "2.0.0",
     "@uirouter/angularjs": "1.0.16",
-    "@uirouter/core": "5.0.18"
+    "@uirouter/core": "5.0.19"
   },
   "peerDependencies": {
-    "@angular/core": "^4.0.0 || ^5.0.0",
-    "@angular/upgrade": "^4.0.0 || ^5.0.0",
+    "@angular/core": "^5.0.0 || ^6.0.0",
+    "@angular/upgrade": "^5.0.0 || ^6.0.0",
     "angular": "^1.5.0"
   },
   "devDependencies": {
-    "@angular/common": "^4.0.0",
-    "@angular/compiler": "^4.0.0",
-    "@angular/compiler-cli": "^4.0.0",
-    "@angular/core": "^4.0.0",
-    "@angular/platform-browser": "^4.0.0",
-    "@angular/platform-browser-dynamic": "^4.0.0",
-    "@angular/upgrade": "^4.0.0",
+    "@angular/common": "^5.0.0",
+    "@angular/compiler": "^5.0.0",
+    "@angular/compiler-cli": "^5.0.0",
+    "@angular/core": "^5.0.0",
+    "@angular/platform-browser": "^5.0.0",
+    "@angular/platform-browser-dynamic": "^5.0.0",
+    "@angular/upgrade": "^5.0.0",
     "@types/angular": "^1.6.43",
     "@types/jquery": "^3.3.1",
     "@uirouter/publish-scripts": "^2.3.12",
@@ -46,7 +46,8 @@
     "rollup-plugin-node-resolve": "^3.2.0",
     "rollup-plugin-sourcemaps": "^0.4.2",
     "rollup-plugin-uglify": "^3.0.0",
-    "rxjs": "^5.5.6",
+    "rxjs": "^6.1.0",
+    "rxjs-compat": "^6.1.0",
     "shx": "^0.2.2",
     "typescript": "^2.8.3",
     "zone.js": "^0.8.20"