Added mirror for 1.21 beta version from ModDB.

TheDoctor0 · web-flow · commit 0ab0f7549e4d · 2019-02-01T19:30:26.000+01:00
diff --git a/version.txt b/version.txt
@@ -1 +1 @@
-1.2 https://cs-reload.pl/csco/ClassicOffensive.zip
+1.21 https://cs-reload.pl/csco/ClassicOffensive.zip

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-1.2 https://cs-reload.pl/csco/ClassicOffensive.zip`
	`1`	`+1.21 https://cs-reload.pl/csco/ClassicOffensive.zip`