Minimal version requirements in setup.py and exhaustive listing of pinned versions in requirements.txt. Added matplotlib

requirements.in

@@ -1,2 +1,3 @@
 numpy
 scipy
+matplotlib

requirements.txt

@@ -4,5 +4,11 @@
 #
 #    pip-compile --output-file requirements.txt requirements.in
 #
-numpy==1.13.3
-scipy==0.19.1
+cycler==0.10.0            # via matplotlib
+kiwisolver==1.0.1         # via matplotlib
+matplotlib==3.0.2
+numpy==1.16.1
+pyparsing==2.3.1          # via matplotlib
+python-dateutil==2.8.0    # via matplotlib
+scipy==1.2.1
+six==1.12.0               # via cycler, python-dateutil

setup.py

@@ -8,7 +8,7 @@ setup(name='brukeropusreader',
       author_email='brukeropusreader-dev@qed.ai',
       packages=['brukeropusreader'],
       python_requires=">=3",
-      install_requires=['numpy==1.13.3', 'scipy==0.19.1'],
+      install_requires=['numpy>=1.13.3', 'scipy>=0.19.1', 'matplotlib>=3.0.2'],
       license="GPLv3",
       url="https://github.com/qedsoftware/brukeropusreader"
       )