repaired bad codeblocks

README.md

@@ -45,7 +45,7 @@ Versions:
 ./configure
 make
 make install
-'''
+```
 
 #### opal
 ```bash
@@ -53,16 +53,16 @@ make install
 make -j5
 make runtest
 make install
-'''
+```
 
 #### t38modem
 If you are getting error about `-1` not being able to be casted to a `long unsigned int` due to `-Wnarrowing` inside `dle.cxx`, you can add `-Wno-narrowing` after the `CPPFLAGS` in the Makefile to disable this error
 
-'''bash
+```bash
 git clone https://github.com/hehol/t38modem
 cd t38modem
 make
-'''
+```
 
 If running the t38modem executable, you should run these commands
 ```bash