tools/upgrade: Adjust shell quoting

tools/upgrade.sh

@@ -6,12 +6,12 @@ if which tput >/dev/null 2>&1; then
     ncolors=$(tput colors)
 fi
 if [ -t 1 ] && [ -n "$ncolors" ] && [ "$ncolors" -ge 8 ]; then
-  RED="$(tput setaf 1)"
-  GREEN="$(tput setaf 2)"
-  YELLOW="$(tput setaf 3)"
-  BLUE="$(tput setaf 4)"
-  BOLD="$(tput bold)"
-  NORMAL="$(tput sgr0)"
+  RED=$(tput setaf 1)
+  GREEN=$(tput setaf 2)
+  YELLOW=$(tput setaf 3)
+  BLUE=$(tput setaf 4)
+  BOLD=$(tput bold)
+  NORMAL=$(tput sgr0)
 else
   RED=""
   GREEN=""
@@ -33,7 +33,7 @@ if git -C "$OSH" pull --rebase --stat origin master; then
   printf '%s\n' '                        /____/                            '
   printf "${BLUE}%s\n" "Hooray! Oh My Bash has been updated and/or is at the current version."
   printf "${BLUE}${BOLD}%s${NORMAL}\n" "To keep up on the latest news and updates, follow us on GitHub: https://github.com/ohmybash/oh-my-bash"
-  exec bash; source $HOME/.bashrc
+  exec bash; source ~/.bashrc
 else
   printf "${RED}%s${NORMAL}\n" 'There was an error updating. Try again later?'
 fi