message: MAINT: Remove Rust 1.12 from .travis file
  Several crates now don't support it, so stop building it on travis
  (we'll drop it next major bump anyway).
diff: @@ -2,15 +2,6 @@ language: rust
  sudo: false
  matrix:
  include:
  - - rust: 1.12.0
  - before_script:
  - # rand 0.4.2 requires rust 1.15, and rand-0.3.22 requires rand-0.4 :/
  - # manually hacking the lockfile due to the limitations of cargo#2773
  - - cargo generate-lockfile
  - - sed -i -e 's/"rand 0.[34].[0-9]\+/"rand 0.3.20/' Cargo.lock
  - - sed -i -e '/^name = "rand"/,/^$/s/version = "0.3.[0-9]\+"/version = "0.3.20"/' Cargo.lock
  - env:
  - - ALL=' '
  - rust: 1.15.0
  env:
  - ALL=' '
  