Add pip dependence explicitly in other builds

Author: makbigc

ci/deps/azure-windows-36.yaml

@@ -23,6 +23,7 @@ dependencies:
   - xlwt
   # universal
   - cython>=0.28.2
+  - pip
   - pytest>=5.0.1
   - pytest-xdist>=1.29.0
   - pytest-mock

ci/deps/azure-windows-37.yaml

@@ -26,6 +26,7 @@ dependencies:
   - xlwt
   # universal
   - cython>=0.28.2
+  - pip
   - pytest>=5.0.0
   - pytest-xdist>=1.29.0
   - pytest-mock

ci/deps/travis-36-slow.yaml

@@ -25,6 +25,7 @@ dependencies:
   - xlsxwriter
   - xlwt
   # universal
+  - pip
   - pytest>=5.0.0
   - pytest-xdist>=1.29.0
   - pytest-mock