Merge pull request #49 from ChristopherDaigle/master

Requirements updated to "safe" versions

requirements.txt

@@ -20,7 +20,7 @@ ipython==6.5.0
 ipython-genutils==0.2.0
 ipywidgets==7.4.0
 jedi==0.12.1
-Jinja2==2.10
+Jinja2==2.10.1
 jsonschema==2.6.0
 jupyter==1.0.0
 jupyter-client==5.2.3
@@ -33,7 +33,7 @@ mkl-fft==1.0.4
 mkl-random==1.0.1
 nbconvert==5.3.1
 nbformat==4.4.0
-notebook==5.6.0
+notebook==5.7.8
 numpy==1.13.3
 pandocfilters==1.4.2
 parso==0.3.1
@@ -61,7 +61,7 @@ terminado==0.8.1
 testpath==0.3.1
 tornado==5.1
 traitlets==4.3.2
-Twisted==18.7.0
+twisted==19.7.0 
 wcwidth==0.1.7
 webencodings==0.5.1
 widgetsnbextension==3.4.0