Update dependency Flask-WTF to v0.15.1

Author: renovate[bot]

_RESOURCES/course-work/python-project-starter/Pipfile

@@ -12,7 +12,7 @@ six = "==1.15.0"
 Flask = "==1.1.2"
 Flask-Cors = "==3.0.8"
 Flask-SQLAlchemy = "==2.4.4"
-Flask-WTF = "==0.14.3"
+Flask-WTF = "==0.15.1"
 Jinja2 = "==2.11.2"
 MarkupSafe = "==2.0.1"
 SQLAlchemy = "==1.3.19"