buildcmd was using echo, changed to print

lua/buildcmd.lua

@@ -2,7 +2,7 @@ local job_id, job_buffer
 
 local function job_exit(jobId, exit_code, _)
     job_id = nil
-    echo("Job done")
+    print("job done!")
 end
 
 local function has_buffer()
@@ -11,7 +11,7 @@ end
 
 function save_all_and_build()
     if job_id then
-        echo ("Job processing")
+        print("Job processing")
         return
     end