fix travis postgres tests. changenote.

.travis/setup-postgres.sh

@@ -1,2 +1,2 @@
 pip install -U -e ".[postgresql]"
-`dirname`/postgres.sh
+`dirname $0`/postgres.sh

.travis/setup-pypostgres.sh

@@ -1,2 +1,2 @@
 pip install -U pg8000
-`dirname`/postgres.sh
+`dirname $0`/postgres.sh

CHANGES.rst

@@ -38,7 +38,10 @@
 - MySQL uses (what should be) a slightly more efficient poll query.
   See :issue:`89`.
 
-- PyMySQL now works on Python 3.
+- PyMySQL now works and is tested on Python 3.
+
+- A pure-Python PostgreSQL driver, pg8000, now works and is tested on
+  all platforms. This is a gevent-compatible driver.
 
 - Support for cx_Oracle versions older than 5.0 has been dropped. 5.0
   was released in 2008.