restore the copyright from the origin of powerlevel9k

LICENSE

@@ -1,3 +1,4 @@
+Copyright (c) 2009-2014 Robby Russell and contributors (see https://github.com/robbyrussell/oh-my-zsh/contributors)
 Copyright (c) 2014-2017 Ben Hilburn <bhilburn@gmail.com>
 Copyright (c) 2019 Roman Perepelitsa <roman.perepelitsa@gmail.com>
 

powerlevel9k.zsh-theme

@@ -1,13 +1,13 @@
 # vim:ft=zsh ts=2 sw=2 sts=2 et fenc=utf-8
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-# powerlevel10k Theme
+# Powerlevel10k Theme
 # https://github.com/romkatv/powerlevel10k
 #
 # Forked from powerlevel9k Theme
 # https://github.com/bhilburn/powerlevel9k
 #
-# Which was inspired by agnoster's Theme:
-# https://gist.github.com/3712874
+# Which in turn was forked from agnoster Theme
+# https://github.com/robbyrussell/oh-my-zsh/blob/74177c5320b2a1b2f8c4c695c05984b57fd7c6ea/themes/agnoster.zsh-theme
 ################################################################
 
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