Update mypy roadmap (#3970)

Author: JukkaL

ROADMAP.md

@@ -9,28 +9,16 @@ core team member that nobody else is working on the same thing.
 on, and everything is subject to change. Near-term plans are likely
 more accurate.
 
-## July-December 2017
+## September-December 2017
 
 - Fix remaining highest-priority TypedDict issues and make TypedDict
   an officially supported mypy feature.
 
-- Document basic properties of all type operations used within mypy,
-  including compatibility, proper subtyping, joins and meets.
-  ([issue](https://github.com/python/mypy/issues/3454))
+- Add support for protocols and structural subtyping (PEP 544).
 
 - Continue making error messages more useful and informative.
   ([issue](https://github.com/python/mypy/labels/topic-usability))
 
-- Resolve [#2008](https://github.com/python/mypy/issues/2008) (we are
-  converging on approach 4).
-
-- Invest some effort into systematically filling in missing
-  annotations and stubs in typeshed, with focus on features heavily
-  used at Dropbox. Better support for ORMs will be a separate
-  project.
-
-- Add support for protocols and structural subtyping (PEP 544).
-
 - Switch completely to pytest and remove the custom testing framework.
   ([issue](https://github.com/python/mypy/issues/1673))
 
@@ -43,11 +31,22 @@ more accurate.
   fine-grained incremental type checking, built on top the daemon
   mode.
 
+- Document basic properties of all type operations used within mypy,
+  including compatibility, proper subtyping, joins and meets.
+  ([issue](https://github.com/python/mypy/issues/3454))
+
+## 2018
+
 - Refactor and simplify specific tricky parts of mypy internals, such
   as the [conditional type binder](https://github.com/python/mypy/issues/3457),
   [symbol tables](https://github.com/python/mypy/issues/3458) or
   the various [semantic analysis passes](https://github.com/python/mypy/issues/3459).
 
+- Invest some effort into systematically filling in missing
+  annotations and stubs in typeshed, with focus on features heavily
+  used at Dropbox. Better support for ORMs will be a separate
+  project.
+
 - Make the mypy plugin architecture more general and officially
   supported. It should be able to support some typical ORM features at
   least, such as metaclasses that add methods with automatically