Update scipy version requirement

Author: lmcinnes

.travis.yml

@@ -14,9 +14,9 @@ env:
     - MODULE=hdbscan
   matrix:
     - DISTRIB="conda" PYTHON_VERSION="2.7"
-      NUMPY_VERSION="1.8.2" SCIPY_VERSION="0.11.0" CYTHON_VERSION="0.21"
+      NUMPY_VERSION="1.8.2" SCIPY_VERSION="0.13.3" CYTHON_VERSION="0.23.5"
     - DISTRIB="conda" PYTHON_VERSION="3.5" COVERAGE="true"
-      NUMPY_VERSION="1.10.4" SCIPY_VERSION="0.17.0" CYTHON_VERSION="0.23.4"
+      NUMPY_VERSION="1.10.4" SCIPY_VERSION="0.17.0" CYTHON_VERSION="0.23.5"
 
 install: source ci_scripts/install.sh
 script: bash ci_scripts/test.sh