[FEATURE] Fixed version constraints. Fixes #134.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "ngx-mqtt",
-  "version": "6.10.0",
+  "version": "6.11.0",
   "description": "ngx mqtt client library",
   "main": "bundles/ngx-mqtt.min.js",
   "module": "./src/index.js",
@@ -44,12 +44,12 @@
     "mqtt": "^3.0.0"
   },
   "devDependencies": {
-    "@angular/common": "^6.0.4",
-    "@angular/compiler": "^6.0.4",
-    "@angular/compiler-cli": "^6.0.4",
-    "@angular/core": "^6.0.4",
-    "@angular/platform-browser": "^6.0.4",
-    "@angular/platform-browser-dynamic": "^6.0.4",
+    "@angular/common": ">=6.0.4",
+    "@angular/compiler": ">=6.0.4",
+    "@angular/compiler-cli": ">=6.0.4",
+    "@angular/core": ">=6.0.4",
+    "@angular/platform-browser": ">=6.0.4",
+    "@angular/platform-browser-dynamic": ">=6.0.4",
     "@compodoc/compodoc": "^1.1.3",
     "@types/fs-extra": "^5.0.3",
     "@types/hammerjs": "2.0.33",
@@ -77,7 +77,7 @@
     "ts-helpers": "1.1.2",
     "tslint": "4.5.1",
     "tslint-loader": "3.4.3",
-    "typescript": "2.7.2",
+    "typescript": ">2.7.2 <3.5.0",
     "webpack": "3.1.0",
     "zone.js": "^0.8.26"
   }