modify pymanopt version in requirements

Mokhtar Z. Alaya · Mokhtar Z. Alaya · commit 6d4ccaca7705 · 2020-01-24T09:40:20.000+01:00
diff --git a/requirements.txt b/requirements.txt
@@ -4,7 +4,7 @@ cython
 matplotlib
 sphinx-gallery
 autograd
-pymanopt== 0.2.4, python_version < 3
-pymanopt, python_version >= 3
+pymanopt==0.2.4; python_version <'3'
+pymanopt; python_version >= '3'
 cvxopt
-pytest
+pytest
