Remove Python 2.5 from CI runs.
Remove Python 2.5 from CI runs.

[ci skip]

kcompher/tweepy,truekonrads/tweepy,markunsworth/tweepy,tweepy/tweepy,vikasgorur/tweepy,vishnugonela/tweepy,takeshineshiro/tweepy,srimanthd/tweepy,kskk02/tweepy,ze-phyr-us/tweepy,damchilly/tweepy,techieshark/tweepy,aleczadikian/tweepy,svven/tweepy,kylemanna/tweepy,tuxos/tweepy,tsablic/tweepy,zhenv5/tweepy,robbiewoods05/tweepy,conversocial/tweepy,rudraksh125/tweepy,abhishekgahlot/tweepy,elijah513/tweepy,nickmalleson/tweepy,IsaacHaze/tweepy,Choko256/tweepy,arunxarun/tweepy,LikeABird/tweepy,nickmalleson/tweepy,nickmalleson/tweepy,iamjakob/tweepy,wjt/tweepy,atomicjets/tweepy,edsu/tweepy,yared-bezum/tweepy,markunsworth/tweepy,raymondethan/tweepy,hackebrot/tweepy,abhishekgahlot/tweepy,bconnelly/tweepy,awangga/tweepy,cinemapub/bright-response,nickmalleson/tweepy,cinemapub/bright-response,sa8/tweepy,ze-phyr-us/tweepy,sidewire/tweepy,aganzha/tweepy,thelostscientist/tweepy,vivek8943/tweepy,obskyr/tweepy,cogniteev/tweepy