fixed backticks.

README.md

@@ -15,11 +15,11 @@ AqCGI only depends on libgwenhywfar (see [gwenhywfar](https://www.aquamaniac.de/
 
 ### Build
 Download and unpack tar.gz file, CD into the unpacked folder and build like this:
-'''
+```
 mkdir build
 cd build
 gwbuild -s ..
 gwbuild -jNN (with NN being the number of parallel processes to use, e.g. 4 if compiling on quadcore cpu)
 sudo gwbuild -i
-'''
+```