Added keystone per issue #1819

quicklisp · quicklisp · commit ed4fa6fa32d1 · 2020-03-24T11:42:30.000-04:00
diff --git a/projects/keystone/source.txt b/projects/keystone/source.txt
@@ -0,0 +1 @@
+git https://github.com/GrammaTech/keystone.git

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+git https://github.com/GrammaTech/keystone.git`