Try fixing build in Appveyor.

a740f5c5 · Victor M. Alvarez · 844333aa · a740f5c5
Commit a740f5c5 authored Jul 30, 2018 by Victor M. Alvarez
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appveyor.yml appveyor.yml +1 -1

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--- a/appveyor.yml
+++ b/appveyor.yml
@@ -107,7 +107,7 @@ install:

  # Upgrade to the latest version of pip to avoid it displaying warnings
  # about it being out of date.
-  - "pip install --disable-pip-version-check --user --upgrade pip"
+  - "python -m pip install --disable-pip-version-check --user --upgrade pip"

  # Install the build dependencies of the project. If some dependencies contain
  # compiled extensions and are not provided as pre-built wheel packages,