fix: trying to concat table to create error message in co-routines (#29)

Author: s1n7ax

lua/java-core/utils/async.lua

@@ -38,7 +38,7 @@ local function async(func)
 					return
 				end
 
-				error('unhandled error ' .. thunk)
+				error('unhandled error ' .. tostring(thunk))
 			end
 
 			assert(ok, thunk)