Add check for template in create-github-app

Changelog for 0.9.3:

• PR #197 Added check for template file by @kadern0
• PR #201 Upgrade ofc-bootstrap to 0.13.7 OFC by @Waterdrips
• PR #199 Update to 0.13.6 openfaas-cloud by @Waterdrips

Commits
19a7220 Added check for template file by @kadern0
b2e1794 Upgrade ofc-bootstrap to 0.13.7 OFC by @Waterdrips
1650a9e upgrade to 0.13.6 by @Waterdrips
754c099 Change Customers secret to file and clarify usage by @Waterdrips
1665fd9 Update to 0.13.5 openfaas-cloud by @Waterdrips
be3291d Pull in the standard templates to get "node12" by @alexellis
ab1fa59 Remove duplicated output of stdout by @alexellis
2b9fb85 Don't from value_command when value_from file is present by @alexellis

Generated by Derek