Automate source distribution

Just a quick-and-dirty shell script to automate some of the
things that cabal sdist doesn't quite handle

sdist.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+echo "Generating CHANGELOG.md"
+echo
+
+cat <<HEADER > CHANGELOG.md
+For the full changelog, see
+<https://github.com/lpsmith/postgresql-simple/blob/master/CHANGES.md>
+
+HEADER
+
+perl -ne '$n++ if /^###/; exit if $n==2; print' CHANGES.md >> CHANGELOG.md
+
+cat CHANGELOG.md
+rm -f ./dist/*.tar
+rm -f ./dist/*.tar.gz
+cabal sdist
+cd dist
+wc *.tar.gz
+gunzip *.gz
+wc *.tar
+zopfli *.tar
+wc *.tar.gz
+cd ..
+rm -f ./dist/*.tar