Set release date

drbrain · drbrain · commit 2d1a47fa3d28 · 2010-12-28T10:22:55.000-08:00
diff --git a/History.txt b/History.txt
@@ -1,4 +1,4 @@
-=== 3.1 / 
+=== 3.1 / 2010-12-28
 
 RDoc has moved to github.  Releases after 3.1 reference github unless
 otherwise noted.

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-=== 3.1 /`
	`1`	`+=== 3.1 / 2010-12-28`
`2`	`2`
`3`	`3`	`RDoc has moved to github. Releases after 3.1 reference github unless`
`4`	`4`	`otherwise noted.`