Collapsing some if/else conditions with elif

install.sh

@@ -75,22 +75,19 @@ if [ -z "$METHOD" ]; then
     echo >&2 "You need git, curl, or wget to install nvm"
     exit 1
   fi
-else
-  if [ "~$METHOD" = "~git" ]; then
+elif [ "~$METHOD" = "~git" ]; then
   if ! nvm_has "git"; then
     echo >&2 "You need git to install nvm"
     exit 1
   fi
   install_nvm_from_git
-  fi
-  if [ "~$METHOD" = "~script" ]; then
+elif [ "~$METHOD" = "~script" ]; then
   if ! nvm_has "nvm_download"; then
     echo >&2 "You need curl or wget to install nvm"
     exit 1
   fi
   install_nvm_as_script
 fi
-fi
 
 echo