python-prompt-toolkit: update to version 2.0.4

Update to the latest stable release.  This branch is
incompatible with the 1.x.y releases

Signed-off-by: Derek Straka <derek@asterius.io>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-python/recipes-devtools/python/python-prompt-toolkit_2.0.4.bb

@@ -0,0 +1,6 @@
+inherit pypi setuptools
+require python-prompt-toolkit.inc
+
+RDEPENDS_${PN} += " \
+    ${PYTHON_PN}-subprocess \
+"