run shfmt on installer

install

@@ -5,13 +5,24 @@ install_dir="/usr/local/bin"
 add_alias=0
 nightly=0
 
-while true
-do
+while true; do
     case "${1}" in
-        -a|--alias)       add_alias=1; shift 1;;
-        -n|--nightly)     nightly=1; shift 1;;
-        -p|--prefix)      install_dir=/$2; shift 2;;
-        --)               shift 1; break ;;
+    -a | --alias)
+        add_alias=1
+        shift 1
+        ;;
+    -n | --nightly)
+        nightly=1
+        shift 1
+        ;;
+    -p | --prefix)
+        install_dir=/$2
+        shift 2
+        ;;
+    --)
+        shift 1
+        break
+        ;;
     *) break ;;
     esac
 done
@@ -47,7 +58,10 @@ esac
 
 # get latest version tag from github releases api
 version=$(curl -s "https://api.github.com/repos/$repo/releases/latest" | grep '"tag_name":' | cut -d'"' -f4)
-[ -z "$version" ] && { echo "failed to fetch latest version"; exit 1; }
+[ -z "$version" ] && {
+    echo "failed to fetch latest version"
+    exit 1
+}
 
 # construct download url
 # note: nightly assets are named like "flow-<version>-<os>-<arch>.<ext>"