prepares release 2.0.0 (no Release Candidate anymore)

Author: stefanmedack

app/build.gradle

@@ -41,8 +41,8 @@ android {
         applicationId "de.stefanmedack.ccctv"
         minSdkVersion 21
         targetSdkVersion 26
-        versionCode 8
-        versionName "2.0.0-RC5"
+        versionCode 9
+        versionName "2.0.0"
         resConfigs "en", "de"
         multiDexEnabled true
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"