[pipenv] bump venv fontmake version to 1.5

this change supports use of SOURCE_DATE_EPOCH environment variable for stable checksums in order to create reproducible builds

Author: chrissimpkins

Pipfile

@@ -1,20 +1,13 @@
 [[source]]
-
 url = "https://pypi.python.org/simple"
 verify_ssl = true
 name = "pypi"
 
-
 [packages]
-
 fonttools = "*"
 fontmake = "*"
 
-
 [dev-packages]
 
-
-
 [requires]
-
 python_version = "3.6"