Fixes for IE11, wrt to instance methods

package.json

@@ -132,7 +132,7 @@
   "browserslist": [
     "> 1%",
     "last 2 versions",
-    "IE 10"
+    "IE 11"
   ],
   "optionalDependencies": {
     "webpack-dev-server": "1.14.0"

src/core/plugins/spec/reducers.js

@@ -1,6 +1,7 @@
 import { fromJS } from "immutable"
 import { fromJSOrdered, validateParam } from "core/utils"
 import win from "../../window"
+import findIndex from "lodash/findIndex"
 
 import {
 	UPDATE_SPEC,
@@ -41,7 +42,7 @@ export default {
   [UPDATE_PARAM]: ( state, {payload} ) => {
     let { path, paramName, value, isXml } = payload
     return state.updateIn( [ "resolved", "paths", ...path, "parameters" ], fromJS([]), parameters => {
-      let index = parameters.findIndex( p => p.get( "name" ) === paramName )
+      const index = findIndex(parameters, p => p.get( "name" ) === paramName )
       if (!(value instanceof win.File)) {
         value = fromJSOrdered( value )
       }

src/core/utils.js

@@ -418,11 +418,6 @@ export function pascalCaseFilename(filename) {
   return pascalCase(filename.replace(/\.[^./]*$/, ""))
 }
 
-// Only compare a set of props
-export function shallowEqualKeys(a,b, keys) {
-  return !!keys.find(key => !shallowEqual(a[key], b[key]))
-}
-
 // Check if ...
 // - new props
 // - If immutable, use .is()