Update Python dependencies

Author: mdmintz

requirements.txt

@@ -41,12 +41,12 @@ beautifulsoup4==4.9.1
 cryptography==3.0;python_version<"3.6"
 cryptography==3.1;python_version>="3.6"
 pyopenssl==19.1.0
-prompt-toolkit==1.0.18;python_version<"3.6.1"
-prompt-toolkit==3.0.7;python_version>="3.6.1"
 pygments==2.5.2;python_version<"3.5"
 pygments==2.6.1;python_version>="3.5"
 traitlets==4.3.3;python_version<"3.7"
 traitlets==5.0.0;python_version>="3.7"
+prompt-toolkit==1.0.18;python_version<"3.6"
+prompt-toolkit==3.0.7;python_version>="3.6"
 ipython==5.10.0;python_version<"3.5"
 ipython==6.5.0;python_version>="3.5" and python_version<"3.6"
 ipython==7.16.1;python_version>="3.6" and python_version<"3.7"

setup.py

@@ -133,13 +133,13 @@
         'cryptography==3.0;python_version<"3.6"',
         'cryptography==3.1;python_version>="3.6"',
         'pyopenssl==19.1.0',
-        'prompt-toolkit==1.0.18;python_version<"3.6.1"',
-        'prompt-toolkit==3.0.7;python_version>="3.6.1"',
         'pygments==2.5.2;python_version<"3.5"',
         'pygments==2.6.1;python_version>="3.5"',
         'traitlets==4.3.3;python_version<"3.7"',
         'traitlets==5.0.0;python_version>="3.7"',
         'ipython==5.10.0;python_version<"3.5"',
+        'prompt-toolkit==1.0.18;python_version<"3.6"',
+        'prompt-toolkit==3.0.7;python_version>="3.6"',
         'ipython==6.5.0;python_version>="3.5" and python_version<"3.6"',
         'ipython==7.16.1;python_version>="3.6" and python_version<"3.7"',
         'ipython==7.18.1;python_version>="3.7"',