rockspec: unlock dependencies

Author: DifferentialOrange

crud-scm-1.rockspec

@@ -7,8 +7,8 @@ source  = {
 
 dependencies = {
     'lua ~> 5.1',
-    'checks == 3.1.0-1',
-    'errors == 2.2.1-1',
+    'checks >= 3.1.0-1',
+    'errors >= 2.2.1-1',
     'vshard >= 0.1.18-1',
 }