requirements.txt: fix overspecification (#1668)

I accidentally added the patch-level for version-compatible matching

This removes the patch-level for `~=` matching for the packages that
have a >=1 major version already.

Author: ax3l

requirements.txt

@@ -1,7 +1,7 @@
-numpy~=1.15.0
-periodictable~=1.5.3
+numpy~=1.15
+periodictable~=1.5
 picmistandard==0.0.13
-scipy~=1.6.0  # picmistandard bug: https://github.com/picmi-standard/picmi/pull/34
+scipy~=1.6  # picmistandard bug: https://github.com/picmi-standard/picmi/pull/34
 # optional, some used for testing:
 # yt
 # openpmd-api

setup.py

@@ -199,7 +199,7 @@ def build_extension(self, ext):
     #    ]
     #},
     extras_require={
-        'all': ['openPMD-api~=0.13.0', 'openPMD-viewer~=1.1.0', 'yt~=3.6.1', 'matplotlib'],
+        'all': ['openPMD-api~=0.13.0', 'openPMD-viewer~=1.1', 'yt~=3.6', 'matplotlib'],
     },
     # cmdclass={'test': PyTest},
     # platforms='any',