fixing loadstring() Lua5.3 issue

ChangeLog

@@ -5,6 +5,8 @@
 			a trailing '/' to it, since that would change it from homedir to rootdir!
 	add: example for Amazon S3 Bucket (Daniel Miranda)
 	fix: setting stdout/stderr to linebuffer mode.
+	fix: Lua5.3 compatiblity, using load() instead of loadstring()
+	     Lua5.1 support was thus dropped
 
 2017-02-16: 2.2.2
 	fix: checkgauge 'insist'

lsyncd.lua

@@ -5031,7 +5031,7 @@ function runner.initialize( firstTime )
 			then
 				local ft = functionWriter.translate( config[ fn ] )
 
-				config[ fn ] = assert( loadstring( 'return '..ft ) )( )
+				config[ fn ] = assert( load( 'return '..ft ) )( )
 			end
 		end
 	end