CI: Pin nbconvert to working version.

QuLogic · QuLogic · commit 75da6c8c4039 · 2020-09-11T19:52:35.000-04:00
diff --git a/requirements/testing/travis_extra.txt b/requirements/testing/travis_extra.txt
@@ -1,7 +1,7 @@
 # Extra pip requirements for the travis python 3.7+ builds
 
 ipykernel
-nbconvert[execute]
+nbconvert[execute]!=6.0.0,!=6.0.1
 nbformat!=5.0.0,!=5.0.1
 pandas!=0.25.0
 pikepdf
