A few small fixes #586 (#591)

* Trimmed trailing whitespace
* Fixed erroneous newline at beginning of blacklist
* Fixed erroneous instructions for adding remote in contribution guide (Fixes #586)

CONTRIBUTING.md

@@ -79,7 +79,7 @@ pre-commit checks before committing via `pre-commit run --all-files`
 You should always be working with the latest version of the tool to make pull
 requests easy. If you want to do this easily, just add a second remote to your
 local git repo like this
-`git push --set-upstream origin feature/578-prettier.io-formatting`
+`git remote add upstream https://github.com/igrigorik/videospeed.git`
 
 Now any time you like to pull the latest version in to your local branch you can
 simply issue the command `git pull upstream master`

inject.js

@@ -12,7 +12,7 @@ var tc = {
     startHidden: false, // default: false
     controllerOpacity: 0.3, // default: 0.3
     keyBindings: [],
-    blacklist: `
+    blacklist: `\
       www.instagram.com
       twitter.com
       vine.co

options.js

@@ -17,7 +17,7 @@ var tcDefaults = {
     { action: "reset", key: 82, value: 1, force: false, predefined: true }, // R
     { action: "fast", key: 71, value: 1.8, force: false, predefined: true } // G
   ],
-  blacklist: `
+  blacklist: `\
     www.instagram.com
     twitter.com
     vine.co