Switch escalator from mercurial to git

quicklisp · quicklisp · commit 89ec5519ebcf · 2020-04-12T11:52:04.000-04:00
diff --git a/projects/escalator/source.txt b/projects/escalator/source.txt
@@ -1 +1 @@
-mercurial https://bitbucket.org/elliottslaughter/escalator
+git https://bitbucket.org/elliottslaughter/escalator

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-mercurial https://bitbucket.org/elliottslaughter/escalator`
	`1`	`+git https://bitbucket.org/elliottslaughter/escalator`