fix(core): add missing semver dependency (#472)

Author: dyladan

packages/opentelemetry-core/package.json

@@ -60,17 +60,18 @@
     "karma-webpack": "^4.0.2",
     "mocha": "^6.1.0",
     "nyc": "^14.1.1",
-    "sinon": "^7.3.2",
     "rimraf": "^3.0.0",
-    "tslint-microsoft-contrib": "^6.2.0",
-    "tslint-consistent-codestyle": "^1.15.1",
+    "sinon": "^7.3.2",
     "ts-loader": "^6.0.4",
     "ts-mocha": "^6.0.0",
     "ts-node": "^8.0.0",
+    "tslint-consistent-codestyle": "^1.15.1",
+    "tslint-microsoft-contrib": "^6.2.0",
     "typescript": "^3.6.3",
     "webpack": "^4.35.2"
   },
   "dependencies": {
-    "@opentelemetry/types": "^0.1.1"
+    "@opentelemetry/types": "^0.1.1",
+    "semver": "^6.3.0"
   }
 }