fix modify group notification timestamp issue

distribution/src/main/resources/git.properties

@@ -1,15 +0,0 @@
-#Generated by Git-Commit-Id-Plugin
-#Wed Apr 03 15:25:29 CST 2019
-git.commit.id.abbrev=cc82c5b
-git.commit.user.email=[email protected]
-git.commit.message.full=update version to 0.1.1\n
-git.commit.id=cc82c5b420061994bc0621e807bb6c961370aef2
-git.commit.message.short=update version to 0.1.1
-git.commit.user.name=heavyrain2012
-git.build.user.name=heavyrain2012
-git.commit.id.describe=0.1.1-dirty
-git.build.user.email=[email protected]
-git.branch=wildfirechat
-git.commit.time=20190403134707
-git.build.time=20190403152529
-git.remote.origin.url=https\://github.com/wildfirechat/server.git