feat: add ng@7 as an option for our peerDependency

Author: cal-smith

package.json

@@ -55,14 +55,14 @@
   "license": "Apache-2.0",
   "author": "IBM",
   "peerDependencies": {
-    "@angular/animations": "^6.1.0",
-    "@angular/common": "^6.1.0",
-    "@angular/compiler": "^6.1.0",
-    "@angular/core": "^6.1.0",
-    "@angular/forms": "^6.1.0",
-    "@angular/http": "^6.1.0",
-    "@angular/platform-browser": "^6.1.0",
-    "@angular/platform-browser-dynamic": "^6.1.0",
+    "@angular/animations": "^6.1.0 || ^7.0.0",
+    "@angular/common": "^6.1.0 || ^7.0.0",
+    "@angular/compiler": "^6.1.0 || ^7.0.0",
+    "@angular/core": "^6.1.0 || ^7.0.0",
+    "@angular/forms": "^6.1.0 || ^7.0.0",
+    "@angular/http": "^6.1.0 || ^7.0.0",
+    "@angular/platform-browser": "^6.1.0 || ^7.0.0",
+    "@angular/platform-browser-dynamic": "^6.1.0 || ^7.0.0",
     "core-js": "^2.5.3",
     "rxjs": "^6.0.0",
     "zone.js": "^0.8.26",