Revert gradle change

Signed-off-by: Mario Danic <mario@lovelyhq.com>

build.gradle

@@ -12,7 +12,6 @@ buildscript {
     dependencies {
         classpath 'com.android.tools.build:gradle:3.1.2'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:${kotlinVersion}"
-        classpath 'com.jakewharton:butterknife-gradle-plugin:8.8.1'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files