Add the nginx plugin's hash to certbot-auto during the release process

tools/release.sh

@@ -164,13 +164,13 @@ for module in certbot $subpkgs_modules ; do
 done
 
 # pin pip hashes of the things we just built
-for pkg in acme certbot certbot-apache ; do
+for pkg in acme certbot certbot-apache certbot-nginx ; do
     echo $pkg==$version \\
     pip hash dist."$version/$pkg"/*.{whl,gz} | grep "^--hash" | python2 -c 'from sys import stdin; input = stdin.read(); print "   ", input.replace("\n--hash", " \\\n    --hash"),'
 done > /tmp/hashes.$$
 deactivate
 
-if ! wc -l /tmp/hashes.$$ | grep -qE "^\s*9 " ; then
+if ! wc -l /tmp/hashes.$$ | grep -qE "^\s*12 " ; then
     echo Unexpected pip hash output
     exit 1
 fi