Fix hang and version bump

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

app/build.gradle

@@ -20,8 +20,8 @@ android {
         applicationId 'com.wireguard.android'
         minSdkVersion 21
         targetSdkVersion 27
-        versionCode 413
-        versionName '0.0.20180520'
+        versionCode 414
+        versionName '0.0.20180521'
     }
     externalNativeBuild {
         cmake {

app/tools/wireguard-go

@@ -1 +1 @@
-Subproject commit 7472930d4e7b908646f87adf638188857566a7c6
+Subproject commit 837a12c84151968fac6477f75d6bcb52e7ae64db