build: remove duplicate dependency on TypeScript

TypeScript was added as a dependency in 9a7f5d580. I assume the intention was to
upgrade the existing devDependency instead.

npm-shrinkwrap.clean.json

@@ -1,6 +1,6 @@
 {
   "name": "angular-srcs",
-  "version": "4.2.0-beta.1",
+  "version": "4.3.0-beta.1",
   "dependencies": {
     "@types/angularjs": {
       "version": "1.5.13-alpha"

npm-shrinkwrap.json

@@ -1,6 +1,6 @@
 {
   "name": "angular-srcs",
-  "version": "4.2.0-beta.1",
+  "version": "4.3.0-beta.1",
   "dependencies": {
     "@types/angularjs": {
       "version": "1.5.13-alpha",

package.json

@@ -25,7 +25,6 @@
     "reflect-metadata": "^0.1.3",
     "rxjs": "^5.0.1",
     "tslib": "^1.7.1",
-    "typescript": "^2.3.2",
     "zone.js": "^0.8.12"
   },
   "optionalDependencies": {
@@ -96,7 +95,7 @@
     "tsickle": "^0.21.1",
     "tslint": "^4.1.1",
     "tslint-eslint-rules": "^3.1.0",
-    "typescript": "^2.1.5",
+    "typescript": "^2.3.2",
     "universal-analytics": "^0.3.9",
     "vrsource-tslint-rules": "^4.0.0",
     "webpack": "^1.12.6",