D3037: repo: remove now-unused changectx() method (API)

[martinvonz (Martin von Zweigbergk)]

martinvonz added a comment.


  In https://phab.mercurial-scm.org/D3037#49157, @pulkit wrote:
  
  > I know it's pretty obvious to us that repo.__getitem__ should be used instead but I will like to have that in commit description so when we look back, or someone updates their extensions, some time can be saved.
  
  
  Makes sense. Done.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D3037

To: martinvonz, #hg-reviewers
Cc: pulkit, mercurial-devel