fixup! ADR0002: document deprecation strategy post 1.0

Author: joshuagl

docs/adr/0002-deprecation-strategy.md renamed to docs/adr/0002-pre-1-0-deprecation-strategy.md

@@ -1,4 +1,4 @@
-# Deprecation strategy
+# Deprecation strategy for current release series (0.x)
 
 * Date: 2020-11-05
 
@@ -8,7 +8,7 @@ Technical Story: https://github.com/theupdateframework/tuf/issues/1127
 
 We plan to refactor the reference implementation significantly and, as part of
 that effort, drop support for no-longer maintained versions of Python
-(see ADR 0002).
+(see ADR 0001).
 
 However, a major user of (and contributor to) the project has users of the
 client stuck on older Python versions.