re2: convert .hgignore to .gitignore

Change-Id: I045c5953bae55261eb224a074c10303f9f081424
Reviewed-on: https://code-review.googlesource.com/1271
Reviewed-by: Russ Cox <rsc@swtch.com>
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..3db23b7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+*.pyc
+*.orig
+core
+obj/
diff --git a/.hgignore b/.hgignore
deleted file mode 100644
index bfa7eb7..0000000
--- a/.hgignore
+++ /dev/null
@@ -1,7 +0,0 @@
-syntax:glob
-*.pyc
-*.orig
-core
-
-syntax:regexp
-^obj/