Remove `visit_Fixnum` and `visit_Bignum`
Remove `visit_Fixnum` and `visit_Bignum`

Since Ruby 2.4 unified Fixnum and Bignum into Integer.

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