setup: pin black <20

Due to breaking changes in 20.8b0 https://github.com/psf/black/blob/master/CHANGES.md#208b0
reanahub · Sep 1, 2020 · 8b6ea7b · 8b6ea7b
1 parent d5ce477
commit 8b6ea7b
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diff --git a/pytest_reana/version.py b/pytest_reana/version.py
@@ -14,4 +14,4 @@
 
 from __future__ import absolute_import, print_function
 
-__version__ = "0.7.0.dev20200707"
+__version__ = "0.7.0a1"
diff --git a/setup.py b/setup.py
@@ -34,7 +34,7 @@
 
 install_requires = [
     "apispec>=0.21.0,<0.40",
-    'black>=19.10b0 ; python_version>="3"',
+    'black>=19.10b0,<20 ; python_version>="3"',
     "check-manifest>=0.25,<1",
     "checksumdir>=1.1.4,<1.2",
     "click>=7.0",