bug fix 3.7.2 build failure

MilosAtz · MilosAtz · commit 7df90af98ac8 · 2021-12-06T19:09:45.000-06:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,8 +1,8 @@
 language: python
 python:
-  - "3.6"
-  - "3.7"
-  - "3.8"
+  #- "3.6"
+  - "3.7.2"
+  #- "3.8"
   # - "weekly"  # weekly build
   # - "nightly"  # nightly build
 # command to install dependencies
diff --git a/requirements.txt b/requirements.txt
@@ -6,3 +6,4 @@ matplotlib>=3.2
 numpy>=1.18
 codecov==2.1.11
 dill==0.3.4
+packaging>=20.0
