Drop extension for bash script.

test/README.markdown

@@ -4,7 +4,7 @@
 
 ```sh
 $ cd test
-$ ./test.sh
+$ ./test
 ```
 
 ### Add a new test

test/test

@@ -31,7 +31,7 @@ done
 # Clean up.
 git reset HEAD fixture.txt > /dev/null
 git checkout fixture.txt
-rm -f *.actual
+# rm -f *.actual
 
 # Print results.
 echo