Add yank module and update script

modules/yank/README.md

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+Yank
+===
+
+Defines [yank](https://github.com/mptre/yank) aliases.
+
+Aliases
+-------
+
+See [init.zsh](init.zsh) script.

modules/yank/init.zsh

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+#
+# Defines yank aliases.
+#
+# Authors:
+#   Daniel Carrillo
+#
+
+# Return if requirements are not found.
+if (( ! $+commands[yank] )); then
+  return 1
+fi
+
+#
+# Aliases
+#
+
+alias yenv="env | yank -d ="     # yank environment variables
+
+#
+# Piping aliases
+#
+
+alias yl="yank -l"               # yank a whole line from command output
+alias yle="yank -l -- sh"        # yank a whole line from command output and
+                                 # exec the line as a command

scripts/update_zprezto

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+#!/bin/zsh
+
+set -ex
+
+cd ~/.zprezto
+
+git fetch upstream
+git checkout master
+git merge i -m "Merged" upstream/master
+git submodule update --init --recursive
+
+cd -