Update pytest to the latest release because of the error:

https://travis-ci.org/github/syrusakbary/promise/jobs/708523881 E AttributeError: type object 'Function' has no attribute 'from_parent' latest pytest does not support python 2
alex-verve · Jul 15, 2020 · e726e0b · e726e0b
1 parent 4627315
commit e726e0b
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diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,6 @@
 language: python
 sudo: false
 python:
-- 2.7
 - 3.5
 - 3.6
 - 3.7

diff --git a/setup.py b/setup.py
@@ -14,7 +14,7 @@
 IS_PY3 = sys.hexversion >= 0x03000000
 
 tests_require = [
-    "pytest>=2.7.3",
+    "pytest>=5.4.3",
     "pytest-cov",
     "coveralls",
     "futures",