bundle update resque-scheduler to latest version
bundle update resque-scheduler to latest version

Resque 2.0 includes grammar fixes for warnings tickled by our tests. Updating resque-scheduler also requires and updates resque to version 2.0.

```
$ ruby -v
ruby 2.6.2p47 (2019-03-13 revision 67232) [x86_64-linux]
```

fabianoleittes/rails,yahonda/rails,Envek/rails,esparta/rails,Edouard-chin/rails,eileencodes/rails,betesh/rails,rails/rails,repinel/rails,arunagw/rails,BlakeWilliams/rails,esparta/rails,Edouard-chin/rails,yawboakye/rails,Stellenticket/rails,kddeisz/rails,Erol/rails,BlakeWilliams/rails,schuetzm/rails,gauravtiwari/rails,Edouard-chin/rails,eileencodes/rails,yahonda/rails,esparta/rails,yalab/rails,tgxworld/rails,bogdanvlviv/rails,yalab/rails,eileencodes/rails,georgeclaghorn/rails,gauravtiwari/rails,rafaelfranca/omg-rails,prathamesh-sonpatki/rails,mechanicles/rails,tgxworld/rails,prathamesh-sonpatki/rails,tjschuck/rails,iainbeeston/rails,Erol/rails,lcreid/rails,vipulnsward/rails,kmcphillips/rails,kmcphillips/rails,georgeclaghorn/rails,shioyama/rails,iainbeeston/rails,prathamesh-sonpatki/rails,esparta/rails,Vasfed/rails,Erol/rails,MSP-Greg/rails,bogdanvlviv/rails,yalab/rails,betesh/rails,starknx/rails,palkan/rails,MSP-Greg/rails,georgeclaghorn/rails,kmcphillips/rails,lcreid/rails,betesh/rails,Stellenticket/rails,tgxworld/rails,shioyama/rails,kmcphillips/rails,repinel/rails,notapatch/rails,repinel/rails,Edouard-chin/rails,Vasfed/rails,yawboakye/rails,iainbeeston/rails,rails/rails,flanger001/rails,starknx/rails,Vasfed/rails,gauravtiwari/rails,jeremy/rails,yawboakye/rails,yhirano55/rails,vipulnsward/rails,Vasfed/rails,BlakeWilliams/rails,Envek/rails,fabianoleittes/rails,yahonda/rails,fabianoleittes/rails,palkan/rails,starknx/rails,yhirano55/rails,flanger001/rails,bogdanvlviv/rails,palkan/rails,arunagw/rails,repinel/rails,rails/rails,arunagw/rails,yawboakye/rails,yalab/rails,Envek/rails,flanger001/rails,mechanicles/rails,rails/rails,shioyama/rails,shioyama/rails,EmmaB/rails-1,yahonda/rails,iainbeeston/rails,joonyou/rails,EmmaB/rails-1,rafaelfranca/omg-rails,jeremy/rails,vipulnsward/rails,joonyou/rails,yhirano55/rails,tjschuck/rails,tjschuck/rails,eileencodes/rails,mechanicles/rails,Erol/rails,lcreid/rails,Stellenticket/rails,schuetzm/rails,lcreid/rails,palkan/rails,yhirano55/rails,betesh/rails,kddeisz/rails,kddeisz/rails,notapatch/rails,georgeclaghorn/rails,joonyou/rails,EmmaB/rails-1,joonyou/rails,jeremy/rails,prathamesh-sonpatki/rails,MSP-Greg/rails,schuetzm/rails,fabianoleittes/rails,rafaelfranca/omg-rails,schuetzm/rails,mechanicles/rails,MSP-Greg/rails,Stellenticket/rails,vipulnsward/rails,Envek/rails,BlakeWilliams/rails,notapatch/rails,flanger001/rails,notapatch/rails,bogdanvlviv/rails,jeremy/rails,kddeisz/rails,arunagw/rails,tjschuck/rails,tgxworld/rails