.travis.yml: upgrade pip first

diff --git a/.travis.yml b/.travis.yml
index 178fc63..e2de7cd 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -81,7 +81,10 @@ before_install:
 
 install:
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then travis_retry pip install nose2; fi
-  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then travis_retry pip install --user nose2; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
+      travis_retry pip install --user --upgrade pip
+      travis_retry pip install --user nose2
+    fi;
 
 script:
   - make create_test_sounds