Remove rubygems version lock
Remove rubygems version lock

This version lock added by 3d890b66c1bfbdcabb7ef66e0774e0f01e2ed5d6.
But original issue is fixed with bundler 1.15.

Ref: https://github.com/rubygems/rubygems/issues/1911#issuecomment-300148516

MSP-Greg/rails,MSP-Greg/rails,Envek/rails,ledestin/rails,gauravtiwari/rails,utilum/rails,alecspopa/rails,MSP-Greg/rails,deraru/rails,arunagw/rails,mechanicles/rails,vipulnsward/rails,maicher/rails,baerjam/rails,joonyou/rails,BlakeWilliams/rails,kmcphillips/rails,georgeclaghorn/rails,maicher/rails,Stellenticket/rails,jeremy/rails,assain/rails,yasslab/railsguides.jp,yasslab/railsguides.jp,aditya-kapoor/rails,Edouard-chin/rails,lcreid/rails,prathamesh-sonpatki/rails,gauravtiwari/rails,tjschuck/rails,yawboakye/rails,repinel/rails,brchristian/rails,Erol/rails,notapatch/rails,untidy-hair/rails,kmcphillips/rails,georgeclaghorn/rails,illacceptanything/illacceptanything,kmcphillips/rails,assain/rails,brchristian/rails,assain/rails,notapatch/rails,BlakeWilliams/rails,prathamesh-sonpatki/rails,mechanicles/rails,rafaelfranca/omg-rails,ngpestelos/rails,betesh/rails,starknx/rails,aditya-kapoor/rails,utilum/rails,Envek/rails,travisofthenorth/rails,travisofthenorth/rails,pvalena/rails,bradleypriest/rails,ttanimichi/rails,kaspth/rails,shioyama/rails,vipulnsward/rails,ledestin/rails,yahonda/rails,repinel/rails,kddeisz/rails,fabianoleittes/rails,travisofthenorth/rails,printercu/rails,illacceptanything/illacceptanything,gfvcastro/rails,illacceptanything/illacceptanything,Stellenticket/rails,printercu/rails,notapatch/rails,tjschuck/rails,alecspopa/rails,mechanicles/rails,starknx/rails,BlakeWilliams/rails,schuetzm/rails,untidy-hair/rails,Sen-Zhang/rails,Envek/rails,rails/rails,pvalena/rails,lcreid/rails,mohitnatoo/rails,baerjam/rails,ledestin/rails,yasslab/railsguides.jp,odedniv/rails,untidy-hair/rails,arunagw/rails,schuetzm/rails,rafaelfranca/omg-rails,gauravtiwari/rails,iainbeeston/rails,rails/rails,joonyou/rails,jeremy/rails,MSP-Greg/rails,flanger001/rails,rafaelfranca/omg-rails,gcourtemanche/rails,schuetzm/rails,aditya-kapoor/rails,kaspth/rails,bradleypriest/rails,Edouard-chin/rails,Vasfed/rails,illacceptanything/illacceptanything,iainbeeston/rails,ttanimichi/rails,assain/rails,ngpestelos/rails,baerjam/rails,gfvcastro/rails,gfvcastro/rails,palkan/rails,esparta/rails,printercu/rails,kmayer/rails,betesh/rails,arunagw/rails,tjschuck/rails,tgxworld/rails,matrinox/rails,iainbeeston/rails,kmcphillips/rails,Stellenticket/rails,starknx/rails,yawboakye/rails,jeremy/rails,printercu/rails,kamipo/rails,tgxworld/rails,tgxworld/rails,matrinox/rails,odedniv/rails,koic/rails,jeremy/rails,fabianoleittes/rails,lcreid/rails,betesh/rails,illacceptanything/illacceptanything,hanystudy/rails,felipecvo/rails,felipecvo/rails,vipulnsward/rails,illacceptanything/illacceptanything,bogdanvlviv/rails,shioyama/rails,travisofthenorth/rails,yalab/rails,bogdanvlviv/rails,EmmaB/rails-1,esparta/rails,gfvcastro/rails,yhirano55/rails,mohitnatoo/rails,illacceptanything/illacceptanything,deraru/rails,flanger001/rails,matrinox/rails,kamipo/rails,notapatch/rails,iainbeeston/rails,yalab/rails,Stellenticket/rails,mohitnatoo/rails,illacceptanything/illacceptanything,utilum/rails,lcreid/rails,shioyama/rails,kddeisz/rails,yahonda/rails,EmmaB/rails-1,kirs/rails-1,pvalena/rails,kddeisz/rails,Sen-Zhang/rails,deraru/rails,shioyama/rails,fabianoleittes/rails,yhirano55/rails,repinel/rails,illacceptanything/illacceptanything,koic/rails,illacceptanything/illacceptanything,georgeclaghorn/rails,eileencodes/rails,BlakeWilliams/rails,mathieujobin/reduced-rails-for-travis,esparta/rails,gcourtemanche/rails,yalab/rails,palkan/rails,kmayer/rails,EmmaB/rails-1,kmayer/rails,yalab/rails,betesh/rails,Edouard-chin/rails,illacceptanything/illacceptanything,yawboakye/rails,yawboakye/rails,fabianoleittes/rails,kirs/rails-1,palkan/rails,rails/rails,gcourtemanche/rails,joonyou/rails,prathamesh-sonpatki/rails,brchristian/rails,schuetzm/rails,illacceptanything/illacceptanything,prathamesh-sonpatki/rails,arunagw/rails,Vasfed/rails,alecspopa/rails,kamipo/rails,bogdanvlviv/rails,illacceptanything/illacceptanything,maicher/rails,eileencodes/rails,baerjam/rails,koic/rails,ttanimichi/rails,illacceptanything/illacceptanything,yhirano55/rails,yahonda/rails,Erol/rails,Vasfed/rails,untidy-hair/rails,georgeclaghorn/rails,Erol/rails,Sen-Zhang/rails,mechanicles/rails,rails/rails,utilum/rails,Erol/rails,flanger001/rails,repinel/rails,felipecvo/rails,hanystudy/rails,kirs/rails-1,illacceptanything/illacceptanything,esparta/rails,ngpestelos/rails,yahonda/rails,hanystudy/rails,Edouard-chin/rails,vipulnsward/rails,palkan/rails,odedniv/rails,flanger001/rails,eileencodes/rails,yasslab/railsguides.jp,yhirano55/rails,joonyou/rails,deraru/rails,bradleypriest/rails,mohitnatoo/rails,tjschuck/rails,Vasfed/rails,pvalena/rails,Envek/rails,tgxworld/rails,aditya-kapoor/rails,kddeisz/rails,eileencodes/rails,mathieujobin/reduced-rails-for-travis,bogdanvlviv/rails,kaspth/rails,mathieujobin/reduced-rails-for-travis