VelocityRuntimeProvider is now on 'send' package

Align with Gerrit master VelocityRuntimeProvider which has been
moved to the com.google.gerrit.server.mail.send package.

Change-Id: Ia12733ab770c3d4a77248a95b2dcb13a2ddf2523

github-plugin/src/main/java/com/googlesource/gerrit/plugins/github/velocity/PluginVelocityRuntimeProvider.java

diff --git a/github-plugin/src/main/java/com/googlesource/gerrit/plugins/github/velocity/PluginVelocityRuntimeProvider.java b/github-plugin/src/main/java/com/googlesource/gerrit/plugins/github/velocity/PluginVelocityRuntimeProvider.java
index e3a6135..b0ef350 100644
--- a/github-plugin/src/main/java/com/googlesource/gerrit/plugins/github/velocity/PluginVelocityRuntimeProvider.java
+++ b/github-plugin/src/main/java/com/googlesource/gerrit/plugins/github/velocity/PluginVelocityRuntimeProvider.java
@@ -15,7 +15,7 @@
 
 import com.google.gerrit.extensions.annotations.PluginName;
 import com.google.gerrit.server.config.SitePaths;
-import com.google.gerrit.server.mail.VelocityRuntimeProvider.Slf4jLogChute;
+import com.google.gerrit.server.mail.send.VelocityRuntimeProvider.Slf4jLogChute;
 import com.google.inject.Inject;
 import com.google.inject.Provider;
 import com.google.inject.ProvisionException;