upgrade mf2py to 1.1.2 for @veganstraightedge

did this blind, haven't set up or tested the repo myself

Author: snarfed

requirements.txt

@@ -9,7 +9,7 @@ idna==2.5
 itsdangerous==0.24
 Jinja2==2.8
 MarkupSafe==0.23
-mf2py==1.0.5
+mf2py==1.1.2
 mf2util==0.5.0
 packaging==16.8
 pyparsing==2.2.0