Added petalisp per issue #1537

quicklisp · quicklisp · commit 502eb30e0216 · 2018-08-29T18:00:35.000-04:00
diff --git a/projects/petalisp/source.txt b/projects/petalisp/source.txt
@@ -0,0 +1 @@
+git https://github.com/marcoheisig/Petalisp.git

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