Up version number, fix build error.

.travis.yml

@@ -3,7 +3,7 @@ sudo: false
 android:
   components:
     - build-tools-22.0.1
-    - build-tools-23.0.0
+    - build-tools-23.0.1
     - android-23
     - android-22
     - extra-android-support

app/build.gradle

@@ -7,7 +7,7 @@ android {
     defaultConfig {
         minSdkVersion 14
         targetSdkVersion 23
-        versionName "4.2.0a"
+        versionName "4.2.1a"
     }
     sourceSets {
         lightningPlus.setRoot('src/LightningPlus')
@@ -30,12 +30,12 @@ android {
         lightningPlus {
             buildConfigField "boolean", "FULL_VERSION", "true"
             applicationId "acr.browser.lightning"
-            versionCode 81
+            versionCode 82
         }
         lightningLite {
             buildConfigField "boolean", "FULL_VERSION", "false"
             applicationId "acr.browser.barebones"
-            versionCode 82
+            versionCode 83
         }
     }
     lintOptions {