travis for old software

.travis.yml

@@ -5,6 +5,7 @@ env:
   matrix:
     - PYTHON_VERSION="2.7" LATEST="true"
     - PYTHON_VERSION="3.5" LATEST="true"
+    - PYTHON_VERSION="3.6" NUMPY_VERSION="1.11.2" SCIPY_VERSION="0.18.1" PANDAS_VERSION="0.19.1"
     - PYTHON_VERSION="3.6" COVERAGE="true" LATEST="true"
 install: source ./ci/.travis_install.sh
 script: bash ./ci/.travis_test.sh

README.md

@@ -75,6 +75,13 @@ RMSD: 2.6444 Angstrom
 - install the latest PyPI version: `pip install biopandas`
 - install biopandas via conda-forge: `conda install biopandas -c conda-forge`
 
+#### Requirements
+
+- [Python](https://www.python.org) 2.7, 3.5, or 3.6
+- [NumPy](http://www.numpy.org) >= 1.11.2
+- [SciPy](https://www.scipy.org/scipylib/index.html) >= 0.18.1
+- [Pandas](http://pandas.pydata.org) >= 0.19.1
+
 
 For more information, please see [http://rasbt.github.io/biopandas/installation/](http://rasbt.github.io/biopandas/installation/).
 

docs/sources/installation.md

@@ -1,6 +1,15 @@
 # Installing BioPandas ![](img/logos/1j1v_120.png)
 
 
+## Requirements
+
+BioPandas requires the following software and packages:
+
+- [Python](https://www.python.org) 2.7, 3.5, or 3.6
+- [NumPy](http://www.numpy.org) >= 1.11.2
+- [SciPy](https://www.scipy.org/scipylib/index.html) >= 0.18.1
+- [Pandas](http://pandas.pydata.org) >= 0.19.1
+
 
 ## PyPI
 
@@ -10,6 +19,7 @@ You can install the latest stable release of `biopandas` directly from Python's
 pip install biopandas  
 ```
 
+
 ## Conda-forge
 
 Versions of `biopandas` are now also available via [conda-forge](https://github.com/conda-forge/biopandas-feedstock); you can install it via
@@ -47,3 +57,5 @@ Alternatively, you download the package manually from [PYPI](https://pypi.python
 ```bash
 python setup.py install
 ```
+
+