all.bash: run prettier by default

Prettier now runs when./all.bash is executed.

Change-Id: I7fe105d683e93a9a6b2774117289ced951824ea5
Reviewed-on: https://team-review.git.corp.google.com/c/golang/discovery/+/756681
Reviewed-by: Jonathan Amsterdam <jba@google.com>
diff --git a/all.bash b/all.bash
index d126a3c..76007cf 100755
--- a/all.bash
+++ b/all.bash
@@ -127,6 +127,7 @@
   check_staticcheck
   check_misspell
   check_unparam
+  run_prettier
 }
 
 usage() {