Update coveralls from 2.4.0x to 2.6.3
Update coveralls from 2.4.0x to 2.6.3

obraliar/jabref,sauliusg/jabref,jhshinn/jabref,obraliar/jabref,grimes2/jabref,motokito/jabref,Siedlerchr/jabref,Braunch/jabref,mredaelli/jabref,mredaelli/jabref,tschechlovdev/jabref,ayanai1/jabref,ayanai1/jabref,JabRef/jabref,sauliusg/jabref,bartsch-dev/jabref,JabRef/jabref,bartsch-dev/jabref,zellerdev/jabref,Mr-DLib/jabref,tschechlovdev/jabref,JabRef/jabref,zellerdev/jabref,tobiasdiez/jabref,motokito/jabref,Siedlerchr/jabref,zellerdev/jabref,grimes2/jabref,bartsch-dev/jabref,tobiasdiez/jabref,obraliar/jabref,Mr-DLib/jabref,bartsch-dev/jabref,Mr-DLib/jabref,Braunch/jabref,tobiasdiez/jabref,jhshinn/jabref,tschechlovdev/jabref,jhshinn/jabref,mairdl/jabref,mredaelli/jabref,zellerdev/jabref,tschechlovdev/jabref,Braunch/jabref,jhshinn/jabref,motokito/jabref,mredaelli/jabref,zellerdev/jabref,oscargus/jabref,shitikanth/jabref,Siedlerchr/jabref,obraliar/jabref,shitikanth/jabref,ayanai1/jabref,oscargus/jabref,obraliar/jabref,grimes2/jabref,grimes2/jabref,mairdl/jabref,mredaelli/jabref,Mr-DLib/jabref,Braunch/jabref,grimes2/jabref,Mr-DLib/jabref,tobiasdiez/jabref,oscargus/jabref,Siedlerchr/jabref,motokito/jabref,shitikanth/jabref,shitikanth/jabref,bartsch-dev/jabref,JabRef/jabref,sauliusg/jabref,oscargus/jabref,jhshinn/jabref,oscargus/jabref,sauliusg/jabref,mairdl/jabref,ayanai1/jabref,mairdl/jabref,shitikanth/jabref,mairdl/jabref,tschechlovdev/jabref,Braunch/jabref,ayanai1/jabref,motokito/jabref