Fix 5.1 compilation (#694)

kmahar · web-flow · commit 18b95fdfa90b · 2021-10-28T14:04:20.000-04:00
diff --git a/Tests/LinuxMain.swift b/Tests/LinuxMain.swift
@@ -0,0 +1 @@
+// This is a placeholder file which is required for compilation on Swift 5.1.

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+// This is a placeholder file which is required for compilation on Swift 5.1.`