Require less variables for heroku.
Require less variables for heroku.

Fixes #1095

hennevogel/osem,ChrisBr/osem,BelieveC/osem,BelieveC/osem,ChrisBr/osem,Shriyanshagro/osem,kormoc/osem,namangupta01/osem,hennevogel/osem,SeaGL/osem,namangupta01/osem,ChrisBr/osem,bear454/osem,kormoc/osem,namangupta01/osem,kormoc/osem,AndrewKvalheim/osem,Shriyanshagro/osem,rishabhptr/osem,rishabhptr/osem,Shriyanshagro/osem,openSUSE/osem,rishabhptr/osem,AndrewKvalheim/osem,hennevogel/osem,differentreality/osem,differentreality/osem,bear454/osem,bear454/osem,Shriyanshagro/osem,BelieveC/osem,namangupta01/osem,openSUSE/osem,openSUSE/osem,differentreality/osem,SeaGL/osem,hennevogel/osem,differentreality/osem,bear454/osem,rishabhptr/osem,ChrisBr/osem,AndrewKvalheim/osem,kormoc/osem,BelieveC/osem,SeaGL/osem