Fixing requirements.txt take 2

requirements.txt

@@ -1,24 +1,24 @@
 # This file may be used to create an environment using:
 # $ conda create --name <env> --file <this file>
 # platform: linux-64
-python==3.6.2=0
-astropy=2.0.1=np113py36_0
-matplotlib=2.0.2=np113py36_0
-numpy=1.13.1=py36_0
-scipy=0.19.1=np113py36_0
-opencv 3.1.0=np112py36_1
-sqlite=3.13.0=0
+python==3.6.20
+astropy==2.0.1
+matplotlib==2.0.2
+numpy==1.13.1
+scipy==0.19.1
+opencv==3.1.0
+sqlite==3.13.0
 fitsio==0.9.11
 numpydoc==0.8.0
 Pillow==5.1.0
 pycairo==1.17.0
 qtconsole==4.3.1
-bleach=1.5.0=py36_0
-scikit-learn=0.19.0=np113py36_0
+bleach==1.5.0
+scikit-learn==0.19.0
 Sphinx==1.8.3
 sphinx-rtd-theme==0.4.2
 sphinxcontrib-napoleon==0.7
 sphinxcontrib-websupport==1.1.0
 SQLAlchemy==1.2.11
-tk=8.5.18=0
-tornado=4.5.2=py36_0
+tk==8.5.18
+tornado==4.5.2