we need to exec $SHELL -i (interactively)

We install our magic to the interactive config file, and this is probs correct, so ensure we load it.

Fixes pkgxdev/pkgx#358

Author: mxcl

README.md

@@ -2,7 +2,7 @@
 
 [`install.sh`](./install.sh) is delivered when you `curl tea.xyz`.
 
-# GitHub Action 0.13.1
+# GitHub Action 0.13.2
 
 This repository also provides the `tea` GitHub Action.
 

install.sh

@@ -522,8 +522,8 @@ install)
 
 				try it out:
 
-				\`exec $SHELL\`  # or open a new tab
-        \`wget -qO- tea.xyz/white-paper | glow -\`
+				\`exec $SHELL -i\`  # or open a new tab
+				\`wget -qO- tea.xyz/white-paper | glow -\`
 				EoMD
 		fi
 	elif test -n "$TEA_IS_CURRENT"; then