Update Credits about current maintainers of Vim and MacVim

Point to the updated Vim Project maintainers, update some broken links,
and update copyright notice to be more accurate.

Author: ychin

src/MacVim/Credits.rtf

@@ -1,24 +1,32 @@
-{\rtf1\ansi\ansicpg1252\cocoartf1348\cocoasubrtf170
-\cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
+{\rtf1\ansi\ansicpg1252\cocoartf2709
+\cocoascreenfonts1\cocoatextscaling0\cocoaplatform0{\fonttbl\f0\fswiss\fcharset0 Helvetica-Bold;\f1\fswiss\fcharset0 Helvetica;\f2\fswiss\fcharset0 Helvetica-Oblique;
+}
 {\colortbl;\red255\green255\blue255;}
-\vieww9000\viewh8400\viewkind0
-\pard\tx566\tx1133\tx1700\tx2267\tx2834\tx3401\tx3968\tx4535\tx5102\tx5669\tx6236\tx6803\pardirnatural
+{\*\expandedcolortbl;;}
+\vieww18060\viewh8400\viewkind0
+\pard\tx566\tx1133\tx1700\tx2267\tx2834\tx3401\tx3968\tx4535\tx5102\tx5669\tx6236\tx6803\pardirnatural\partightenfactor0
 
 \f0\b\fs24 \cf0 VIM - Vi IMproved
-\b0 \
+\f1\b0 \
+Created by 
+\f2\i Bram Moolenaar\
 
-\i Bram Moolenaar et al.
-\i0 \
+\f1\i0 Currently maintained by {\field{\*\fldinst{HYPERLINK "https://github.com/orgs/vim/people"}}{\fldrslt 
+\f2\i The Vim Project}}\
 \
 
-\b MacVim GUI\
+\f0\b MacVim GUI\
 
-\i\b0 Bj\'f6rn Winckler\
+\f1\b0 Created by 
+\f2\i Bj\'f6rn Winckler\
 
-\i0 \
+\f1\i0 Currently maintained by
+\f2\i  {\field{\*\fldinst{HYPERLINK "https://github.com/orgs/macvim-dev/people"}}{\fldrslt MacVim Developers}}\
+
+\f1\i0 \
 with the help of:\
 
-\i Nico Weber\
+\f2\i Nico Weber\
 George Harker\
 Jjgod Jiang\
 Tim Allen\
@@ -31,16 +39,16 @@ Matt Tolton\
 Kaoru Yoshida\
 Ron Olson\
 Jonathon Mah\
-\pard\pardeftab720
+\pard\pardeftab720\partightenfactor0
 \cf0 Kazuki Sakamoto\
 Vincent Berthoux\
 Nikola Kne\'9eevi\uc0\u263 \
 Dmitry Vazhov\
 {\field{\*\fldinst{HYPERLINK "http://www.cafelinear.com"}}{\fldrslt Douglas Drumond}}\
 {\field{\*\fldinst{HYPERLINK "http://joshpetrie.net"}}{\fldrslt Josh Petrie}}\
-\pard\tx566\tx1133\tx1700\tx2267\tx2834\tx3401\tx3968\tx4535\tx5102\tx5669\tx6236\tx6803\pardirnatural
+\pard\tx566\tx1133\tx1700\tx2267\tx2834\tx3401\tx3968\tx4535\tx5102\tx5669\tx6236\tx6803\pardirnatural\partightenfactor0
 
-\i0 \cf0 \
+\f1\i0 \cf0 \
 ...and many others who have helped by reporting bugs etc.\
 \
 \
@@ -52,6 +60,6 @@ Toolbar icons by {\field{\*\fldinst{HYPERLINK "http://www.mattballdesign.com/"}}
 \
 Revamped MacVim icon by RIC.\
 \
-Thanks to Andy Matuschak for {\field{\*\fldinst{HYPERLINK "http://sparkle.andymatuschak.org/"}}{\fldrslt Sparkle}}.\
+Thanks to Andy Matuschak for {\field{\*\fldinst{HYPERLINK "http://sparkle-project.org"}}{\fldrslt Sparkle}}.\
 \
 Thanks to Damien Guard for {\field{\*\fldinst{HYPERLINK "http://damieng.com/blog/2008/05/26/envy-code-r-preview-7-coding-font-released"}}{\fldrslt Envy Code R}} (used in MacVim's 16x16 document icons).}