chore(deps): update dependency typescript to v3.1.1 (#127)

* chore(deps): update dependency typescript to v3.1.1

* Update index.ts

Author: renovate[bot]

package.json

@@ -59,7 +59,7 @@
     "serve": "10.0.2",
     "tslint": "5.11.0",
     "tslint-config-prettier": "1.15.0",
-    "typescript": "3.0.3"
+    "typescript": "3.1.1"
   },
   "keywords": [
     "if-needed",

src/index.ts

@@ -255,7 +255,7 @@ export default (target: Element, options: Options): CustomScrollAction[] => {
     if (
       cursor === document.body &&
       isScrollable(cursor) &&
-      !isScrollable(document.documentElement)
+      !isScrollable(document.documentElement as HTMLElement)
     ) {
       continue
     }

yarn.lock

@@ -6729,9 +6729,9 @@ typedarray@^0.0.6:
   version "0.0.6"
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
 
-typescript@3.0.3:
-  version "3.0.3"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.0.3.tgz#4853b3e275ecdaa27f78fda46dc273a7eb7fc1c8"
+typescript@3.1.1:
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.1.1.tgz#3362ba9dd1e482ebb2355b02dfe8bcd19a2c7c96"
 
 uglify-js@^3.1.4:
   version "3.4.9"