Update pyprof2calltree from 1.3.2 to 1.4.0

requirements.txt

 flake8==3.2.1
 flake8-debugger==1.4.0
 flake8-blind-except==0.1.1
-pyprof2calltree==1.3.2
+pyprof2calltree==1.4.0
 ipdb==0.10.2
 ipython==5.2.2
 isort==4.2.5