Change gnureadline with prompt toolkit for windows users

Author: johnrieth

requirements.txt

@@ -3,7 +3,6 @@ backports.shutil-get-terminal-size>=1.0.0,<2.0.0
 decorator>=4.0.9,<5.0.0
 entrypoints>=0.2.2,<1.0.0
 enum34>=1.1.6,<2.0.0
-gnureadline>=6.3.3,<7.0.0
 ipykernel>=4.3.1,<5.0.0
 ipython>=4.2.0,<5.0.0
 ipython-genutils>=0.1.0,<1.0.0
@@ -20,6 +19,7 @@ nose>=1.3.7,<2.0.0
 notebook>=4.2.1,<5.0.0
 pexpect>=4.1.0,<5.0.0
 pickleshare>=0.7.2,<1.0.0
+prompt_toolkit>=1.0.0
 ptyprocess>=0.5.1,<1.0.0
 Pygments>=2.1.3,<3.0.0
 pyzmq>=15.2.0,<16.0.0