fix: pass supportVersion to plugin builds and update gradle

Author: Plamen5kov

vendor/gradle-plugin/build.gradle

@@ -2,9 +2,10 @@
 buildscript {
     repositories {
         jcenter()
+        google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.3.2'
+        classpath 'com.android.tools.build:gradle:3.0.1'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -40,3 +41,12 @@ android {
         versionName "1.0"
     }
 }
+
+dependencies {
+    def supportVer = "27.0.1"
+    if (project.hasProperty("supportVersion")) {
+        supportVer = supportVersion
+    }
+    compileOnly "com.android.support:support-v4:$supportVer"
+    compileOnly "com.android.support:appcompat-v7:$supportVer"
+}

vendor/gradle-plugin/gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.0-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-bin.zip