Add Node.js 12 to CI Services (#724)

and remove trailing whitespace from .travis.yml

Co-authored-by: エリス <erisu@users.noreply.github.com>
Co-authored-by: Christopher J. Brody <brodybits@users.noreply.github.com>

.travis.yml

@@ -14,7 +14,8 @@ env:
     - nodejs_version=6
     - nodejs_version=8
     - nodejs_version=10
-  
+    - nodejs_version=12
+
 language: android
 jdk:
   - oraclejdk8
@@ -30,7 +31,7 @@ android:
     - 'google-gdk-license-.+'
 
 before_install:
-  - nvm install $nodejs_version 
+  - nvm install $nodejs_version
   - node --version
   - npm --version
   - gradle --version

appveyor.yml

@@ -11,6 +11,7 @@ environment:
         - nodejs_version: 6
         - nodejs_version: 8
         - nodejs_version: 10
+        - nodejs_version: 12
 
 install:
     # Install Android SDK Tools