README: Update README.md (#168)

README.md

@@ -25,13 +25,13 @@ Oh My Bash is installed by running one of the following commands in your termina
 #### via curl
 
 ```shell
-sh -c "$(curl -fsSL https://raw.githubusercontent.com/ohmybash/oh-my-bash/master/tools/install.sh)"
+bash -c "$(curl -fsSL https://raw.githubusercontent.com/ohmybash/oh-my-bash/master/tools/install.sh)"
 ```
 
 #### via wget
 
 ```shell
-sh -c "$(wget https://raw.githubusercontent.com/ohmybash/oh-my-bash/master/tools/install.sh -O -)"
+bash -c "$(wget https://raw.githubusercontent.com/ohmybash/oh-my-bash/master/tools/install.sh -O -)"
 ```
 
 ## Using Oh My Bash