Renaming watch task for Todomvc example

Author: ethul

README.md

@@ -17,7 +17,7 @@ purescript-angular $ bower install
 
 purescript-angular $ gulp todomvc
 
-purescript-angular $ gulp watch_todomvc
+purescript-angular $ gulp watch.todomvc
 ```
 
 Then visit: [http://localhost:9501/examples/Todomvc/main.html](http://localhost:9501/examples/Todomvc/main.html).

gulpfile.js

@@ -86,7 +86,7 @@ gulp.task('watch', function(cb){
   gulp.watch(config.purescript.src, ['make']);
 });
 
-gulp.task('watch_todomvc', function(cb){
+gulp.task('watch.todomvc', function(cb){
   gulp.watch([config.purescript.examples.todomvc].concat(config.purescript.src), ['todomvc']);
   server(cb);
 });