chore: upgrade gradle version to 4.9-all and upgrade android gradle build plugin

Author: Jacksgong

.idea/gradle.xml

@@ -4,7 +4,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.3'
+        classpath 'com.android.tools.build:gradle:3.3.0-alpha04'
         classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.8.4'
     }
 }

.idea/modules.xml

@@ -1,6 +1,6 @@
-#Fri Jul 13 09:11:03 CST 2018
+#Tue Aug 07 20:00:52 CST 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.9-all.zip