Minor edit

Author: devnich

README.md

@@ -501,7 +501,7 @@ wc -l *.pdb | sort -n | head -n 1
 2.  Once your command history gets big, you might want to search it:
 
     ``` bash
-    history           # or history -1000 in zsh on Mac
+    history           # or `history -1000` in zsh on Mac
     history | grep ls # pipe the output of history into search
     ```
 

README.org

@@ -361,7 +361,7 @@ wc -l *.pdb | sort -n | head -n 1
 
 2. Once your command history gets big, you might want to search it:
    #+BEGIN_SRC bash
-   history           # or history -1000 in zsh on Mac
+   history           # or `history -1000` in zsh on Mac
    history | grep ls # pipe the output of history into search
    #+END_SRC