Adding mention of geocommit.

Author: wooster

.git-gps

@@ -1,7 +1,7 @@
 {
-    "latitude":45.782075,
-    "longitude":-108.505064,
+    "latitude":45.782066,
+    "longitude":-108.505191,
     "altitude":0.000000,
-    "horizontalAccuracy":172.000000,
+    "horizontalAccuracy":164.000000,
     "verticalAccuracy":-1.000000
 }

README.md

@@ -29,3 +29,10 @@ it to the commit.
 This is very alpha-level software, so please file issues, etc. 
 
 Patches welcome!
+
+## Similar Projects
+
+After writing this, I found out about [geocommit](https://github.com/peritus/geocommit), which does something very
+similar, except using git notes. The notes approach keeps the geo coordinates
+local until explicitly synced with the git remote. So, that would be more
+appropriate if you're concerned about privacy.