Note changes since 19.0.0

Author: wsanchez

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## dev (not yet released)
 
+* CPython 3.7 and 3.8 and PyPy3 added to test matrix
+* Hyperlink now has type hints and they are now exported per
+  [PEP 561](https://www.python.org/dev/peps/pep-0561/).
+
 ## 19.0.0
 
 *(April 7, 2019)*
@@ -13,7 +17,8 @@ A query parameter-centric release, with two enhancements:
   [#39](https://github.com/python-hyper/hyperlink/pull/39))
 * `URL.remove()` now accepts *value* and *limit* parameters, allowing
   for removal of specific name-value pairs, as well as limiting the
-  number of removals. (see [#71](https://github.com/python-hyper/hyperlink/pull/71))
+  number of removals.
+  (See [#71](https://github.com/python-hyper/hyperlink/pull/71))
 
 ## 18.0.0