update ubuntu error

update ubuntu error

Author: outman

README.md

@@ -116,16 +116,15 @@ time php dcode.php   2.19s user 0.08s system 99% cpu 2.278 total
 MIT
 ```
 
-Error with Ubuntu
+#### Error with Ubuntu
 ```
 png_create_write_struct in Unknown on line 0 on ubuntu 14
+```
+##### FIX:
 
-FIX:
 
-create soft link
+- create soft link
+```
 sudo ln -s /usr/lib/x86_64-linux-gnu/libpng12.so /usr/lib/x86_64-linux-gnu/libpng.so
-
-Add -L to Makefile
-
-INCLUDES = -I/usr/include/php5 -I/usr/include/php5/main -I/usr/include/php5/TSRM -I/usr/include/php5/Zend -I/usr/include/php5/ext -I/usr/include/php5/ext/date/lib -L/usr/lib/x86_64-linux-gnu -lpng
 ```
+- edit Makefile INCLUDES section, append `-L/usr/lib/x86_64-linux-gnu -lpng` to INCLUDES