gitignore: Allow README.txt, disallow README-wear.txt

- README.txt is no longer autogenerated.
- README-wear.txt has been added to the "wear" teamplate and should
- be ignored.

Change-Id: Ic48b4f658db2a1d99ac2e487192e8d08eb79387f
diff --git a/.gitignore b/.gitignore
index a762655..1756af8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,7 +14,7 @@
 src/common
 src/template
 _index.jd
-README.txt
+README-wear.txt
 
 # Libraries used by the app
 # Can explicitly add if we want, but shouldn't do so blindly.  Licenses, bloat, etc.