Install older miniconda for OSX 3.6 on production deploy branch

Author: iosonofabio

.travis_before_install.sh

@@ -4,16 +4,23 @@ if [ $TRAVIS_OS_NAME == 'linux' ]; then
   sudo add-apt-repository ppa:nschloe/swig-backports -y
   sudo apt-get -qq update
   sudo apt-get install -y swig3.0
+
 elif [ $TRAVIS_OS_NAME == 'osx' ]; then
   echo "Installing deps for OSX"
   if [ $PYTHON_VERSION == "2.7" ]; then
     CONDA_VER='2'
+    CONDA_URL="https://repo.continuum.io/miniconda/Miniconda${CONDA_VER}-latest-MacOSX-x86_64.sh"
+  elif [ $PYTHON_VERSION == "3.7" ]; then
+    CONDA_VER='3'
+    CONDA_URL="https://repo.continuum.io/miniconda/Miniconda${CONDA_VER}-latest-MacOSX-x86_64.sh"
+  # NOTE: Miniconda stopped supporting 3.6, but pysam is late...
   elif [ $PYTHON_VERSION == "3.6" ]; then
     CONDA_VER='3'
+    CONDA_URL='https://repo.continuum.io/miniconda/Miniconda3-4.5.4-MacOSX-x86_64.sh'
   else
     echo "Conda only supports 2.7 and 3.6"
   fi
-  curl "https://repo.continuum.io/miniconda/Miniconda${CONDA_VER}-latest-MacOSX-x86_64.sh" -o "miniconda.sh"
+  curl "${CONDA_URL}" -o "miniconda.sh"
   bash "miniconda.sh" -b -p $HOME/miniconda
   echo "$PATH"
   export PATH="$HOME/miniconda/bin:$PATH"