test/runTest.ts: add missing space in error message

Change-Id: I78c358e40b368a8ef9eb5c188126cae54762e280
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/540077
TryBot-Result: kokoro <noreply+kokoro@google.com>
Commit-Queue: Suzy Mueller <suzmue@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
Run-TryBot: Suzy Mueller <suzmue@golang.org>

test/runTest.ts

diff --git a/test/runTest.ts b/test/runTest.ts
index f4f9f32..b533dba 100644
--- a/test/runTest.ts
+++ b/test/runTest.ts
@@ -37,7 +37,7 @@
 			]
 		});
 	} catch (err) {
-		console.error('Failed to run integration tests' + err);
+		console.error('Failed to run integration tests: ' + err);
 		failed = true;
 	}
 
@@ -59,7 +59,7 @@
 			]
 		});
 	} catch (err) {
-		console.error('Failed to run gopls tests' + err);
+		console.error('Failed to run gopls tests: ' + err);
 		failed = true;
 	}