remove erroneous list of supported Django versions and link to canonical list (#448)

closes #448

Author: beniwohli

docs/django.asciidoc

@@ -365,17 +365,4 @@ Success! We tracked the error successfully! You should be able to see it in a fe
 [[supported-django-and-python-versions]]
 === Supported Django and Python versions
 
-The agent supports the following Django versions:
-
-* 1.8
-* 1.9
-* 1.10
-* 1.11
-* 2.0
-
-and the following Python versions:
-
-* 2.7
-* 3.4
-* 3.5
-* 3.6
+A list of supported <<supported-django,Django>> and <<supported-python,Python>> versions can be found on our <<supported-technologies,Supported Technologies>> page.  

docs/flask.asciidoc

@@ -273,3 +273,9 @@ elasticApm.init({
 ----
 
 See the {apm-rum-ref}[JavaScript RUM agent documentation] for more information.
+
+[float]
+[[supported-flask-and-python-versions]]
+=== Supported Flask and Python versions
+
+A list of supported <<supported-flask,Flask>> and <<supported-python,Python>> versions can be found on our <<supported-technologies,Supported Technologies>> page.  

docs/supported-technologies.asciidoc

@@ -25,6 +25,7 @@ We support these Django versions:
  * 1.11
  * 2.0
  * 2.1
+ * 2.2
 
 For upcoming Django versions, we generally aim to ensure compatibility starting with the first Release Candidate.