Reverted parts of 27542 (pandas-dev#27550)

Author: WillAyd

ci/deps/azure-36-locale.yaml

@@ -7,6 +7,7 @@ dependencies:
   - bottleneck=1.2.*
   - cython=0.28.2
   - lxml
+  - matplotlib=2.2.2
   - numpy=1.14.*
   - openpyxl=2.4.8
   - python-dateutil

ci/deps/travis-36-cov.yaml

@@ -11,6 +11,7 @@ dependencies:
   - gcsfs
   - geopandas
   - html5lib
+  - matplotlib
   - moto
   - nomkl
   - numexpr
@@ -38,8 +39,8 @@ dependencies:
   - xlsxwriter
   - xlwt
   # universal
-  - pytest>=4.0.2,<5.0.0
-  - pytest-xdist==1.28.0
+  - pytest
+  - pytest-xdist
   - pytest-cov
   - pytest-mock
   - hypothesis>=3.58.0

ci/deps/travis-36-locale.yaml

@@ -35,7 +35,7 @@ dependencies:
   - xlwt
   # universal
   - pytest>=4.0.2
-  - pytest-xdist>=1.29.0
+  - pytest-xdist
   - pytest-mock
   - pip
   - pip: