Bring Up To Date + General Tweaks (#26)

* Add nvmrc + bring upto date

* Make imageAlt optional

* Remove rest of jest

* Tweaks

* Update README

* Update node version

* Remove window.location.href from copyToClipboard

* Remove return

* Update package version

* Make copyToClipboard generic

.eslintrc

@@ -2,8 +2,7 @@
   "env": {
     "browser": true,
     "node": true,
-    "es6": true,
-    "jest": true
+    "es6": true
   },
   "parser": "@typescript-eslint/parser",
   "parserOptions": {

.github/workflows/pr.yml

@@ -11,7 +11,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [12.x, 14.x]
+        node-version: [12.x, 14.x, 16.x]
 
     steps:
       - uses: actions/checkout@v1

.github/workflows/release.yml

@@ -10,7 +10,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [12.x, 14.x]
+        node-version: [12.x, 14.x, 16.x]
 
     steps:
       - uses: actions/checkout@v1
@@ -35,7 +35,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v1
         with:
-          node-version: 14
+          node-version: 16
           registry-url: https://registry.npmjs.org/
       - run: npm ci
       - run: npm publish --access=public

.nvmrc

@@ -0,0 +1 @@
+v16.15.0

CONTRIBUTING.md

@@ -11,12 +11,6 @@ Please submit an issue if you need help with anything.
 We have a [code of conduct](./CODE_OF_CONDUCT.md) so please make sure you follow
 it.
 
-## Testing
-
-Testing is performed using `jest` and is tested on Windows, Linux and MacOS with
-Node 10 and 12 runtimes. For a PR to be considered all these environments need to
-pass. Testing is automated using GitHub Actions CI.
-
 ## Submitting changes
 
 Please send a