Increment version to 87

Because 86 was used for alpha test of http logging

Author: misaochan

app/build.gradle

@@ -89,8 +89,8 @@ android {
 
     defaultConfig {
         applicationId 'fr.free.nrw.commons'
-        versionCode 85
-        versionName '2.7.2'
+        versionCode 87
+        versionName '2.8.0'
         setProperty("archivesBaseName", "app-commons-v$versionName-" + getBranchName())
 
         minSdkVersion project.minSdkVersion