bump minimum supported numpy version to 1.13.3

Author: grlee77

.travis.yml

@@ -26,7 +26,7 @@ matrix:
     - os: linux
       python: 3.5
       env:
-        - NUMPYSPEC=numpy
+        - NUMPYSPEC="numpy==1.13.3"
         - MATPLOTLIBSPEC=matplotlib
         - REFGUIDE_CHECK=1  # run doctests only
     - os: osx

README.rst

@@ -66,7 +66,7 @@ Installation
 ------------
 
 PyWavelets supports `Python`_ >=3.5, and is only dependent on `Numpy`_
-(supported versions are currently ``>= 1.9``). To pass all of the tests,
+(supported versions are currently ``>= 1.13.3``). To pass all of the tests,
 `Matplotlib`_ is also required.
 
 There are binary wheels for Intel Linux, Windows and macOS / OSX on PyPi.  If

doc/source/install.rst

@@ -39,7 +39,7 @@ PyWavelets source code directory (containing ``setup.py``) and type::
 The requirements needed to build from source are:
 
  - Python_ 2.7 or >=3.4
- - Numpy_ >= 1.9.1
+ - Numpy_ >= 1.13.3
  - Cython_ >= 0.20.2  (if installing from git, not from a PyPI source release)
 
 To run all the tests for PyWavelets, you will also need to install the

setup.py

@@ -414,8 +414,8 @@ def setup_package():
         cmdclass={'develop': develop_build_clib},
         test_suite='nose.collector',
 
-        install_requires=["numpy>=1.9.1"],
-        setup_requires=["numpy>=1.9.1"],
+        install_requires=["numpy>=1.13.3"],
+        setup_requires=["numpy>=1.13.3"],
     )
 
     if "--force" in sys.argv: