add karma-ie-launcher to dev deps

Author: etpinard

package-lock.json

@@ -139,6 +139,7 @@
     "karma-chrome-launcher": "^2.0.0",
     "karma-fail-fast-reporter": "^1.0.5",
     "karma-firefox-launcher": "^1.0.1",
+    "karma-ie-launcher": "^1.0.0",
     "karma-jasmine": "^1.1.2",
     "karma-jasmine-spec-tags": "^1.0.1",
     "karma-spec-reporter": "0.0.32",