Update requriements for v2.7 release

base_requirements.txt

@@ -54,6 +54,10 @@ djangorestframework
 # https://github.com/axnsan12/drf-yasg
 drf-yasg[validation]
 
+# Platform-agnostic template rendering engine
+# https://github.com/pallets/jinja
+Jinja2
+
 # Simple markup language for rendering HTML
 # https://github.com/Python-Markdown/markdown
 # py-gfm requires Markdown<3.0
@@ -83,6 +87,6 @@ pycryptodome
 # https://github.com/andymccurdy/redis-py
 redis
 
-# Python Package to write SVG files - used for rack elevations
+# SVG image rendering (used for rack elevations)
 # https://github.com/mozman/svgwrite
 svgwrite