Correctly updated git_version.cpp

I can't believe I messed that up in the previous commit. When editing
git_version.cpp manually (as I have to do in a tagged commit, since the
commit-hook script won't work), it's important to change both the
constants and the strings at the same time.

src/core/git_version.cpp

@@ -12,9 +12,9 @@ namespace derecho {
 
 const int MAJOR_VERSION = 2;
 const int MINOR_VERSION = 2;
-const int PATCH_VERSION = 1;
+const int PATCH_VERSION = 2;
 const int COMMITS_AHEAD_OF_VERSION = 0;
 const char* VERSION_STRING = "2.2.2";
-const char* VERSION_STRING_PLUS_COMMITS = "2.2.1+0";
+const char* VERSION_STRING_PLUS_COMMITS = "2.2.2+0";
 
 }