add fish as default shell bootstrap

.config/yadm/bootstrap.d/003_fisher

@@ -6,5 +6,3 @@ else
   echo "installing fisher"
   curl -sL https://git.io/fisher | source && fisher install jorgebucaran/fisher
 end
-
-fisher update

.config/yadm/bootstrap.d/004_fish

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+FISH=$(which fish)
+
+if grep --quiet $FISH /etc/shells; then
+  echo "fish already in shells list"
+else
+  echo "adding fish to shells list"
+  echo $FISH | sudo tee -a /etc/shells
+fi
+
+if [ $FISH == $SHELL ]; then
+  echo "fish already default shell"
+else
+  chsh -s $FISH
+fi