Allow line number stability too (#1)

WoofWare.Expect.Test/SimpleTest.fs

@@ -17,7 +17,7 @@ module SimpleTest =
     let ``Example of a failing test`` () =
         expect {
             snapshot
-                "snapshot mismatch! snapshot at filepath.fs:32 (Example of a failing test) was:
+                "snapshot mismatch! snapshot at filepath.fs:99 (Example of a failing test) was:
 
 - 123
 
@@ -28,10 +28,17 @@ actual was:
             return
                 Assert
                     .Throws<Exception>(fun () ->
-                        expectWithMockedFilePath "filepath.fs" {
+                        expectWithMockedFilePath ("filepath.fs", 99) {
                             snapshot "123"
                             return 124
                         }
                     )
                     .Message
         }
+
+    [<Test>]
+    let ``Basic example`` () =
+        expect {
+            snapshot "123"
+            return 123
+        }