[CI] Upgrade pip when building on AppVeyor

Warning messages from older pip versions cause AppVeyor to think that the build has failed and abort.
2016-11-05 16:24:33 -04:00 · 2016-11-05 16:24:33 -04:00 · 361ca83891
commit 361ca83891
parent deeb6198a0
1 changed files with 1 additions and 0 deletions
--- a/appveyor.yml
+++ b/appveyor.yml
@ -1,6 +1,7 @@
 version: 1.0.{build}
 install:
 - ps: |
+    C:\Python27-x64\Scripts\pip.exe install --upgrade pip
    C:\Python27-x64\Scripts\pip.exe install --egg scons
    C:\Python27-x64\Scripts\pip.exe install numpy
    C:\Python27-x64\Scripts\pip.exe install cython