update authors/contributors list

these additions were made by scanning git log since the last major
update in commit 790580b2fc47bc20e613336cb937a120422a770c. in addition
to git-level commit authorship, "patch by" text in the commit message
was also scanned. this idiom was used in the past for patches that
underwent substantial edits when merging or where the author did not
provide a commit message. going forward, my intent is to use commit
authorship consistently for attribution.

as before my aim was adding everyone with either substantial code
contributions or a pattern of ongoing simple patch submission; any
omissions are unintentional.

COPYRIGHT

@@ -25,22 +25,31 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 Authors/contributors include:
 
+A. Wilcox
 Alex Dowad
 Alexander Monakov
+Andrew Kelley
 Anthony G. Basile
 Arvid Picciani
+Bartosz Brachaczek
 Bobby Bingham
 Boris Brezillon
 Brent Cook
 Chris Spiegel
 Clément Vasseur
 Daniel Micay
+Daniel Sabogal
+Daurnimator
+David Edelsohn
 Denys Vlasenko
+Dmitry Ivanov
+Dmitry V. Levin
 Emil Renner Berthing
 Felix Fietkau
 Felix Janda
 Gianluca Anzolin
 Hauke Mehrtens
+He X
 Hiltjo Posthuma
 Isaac Dunham
 Jaydeep Patil
@@ -50,22 +59,29 @@ Jo-Philipp Wich
 Joakim Sindholt
 John Spencer
 Josiah Worcester
+Julien Ramseier
 Justin Cormack
 Khem Raj
 Kylie McClain
+Leah Neukirchen
 Luca Barbato
 Luka Perkov
 M Farkas-Dyck (Strake)
 Mahesh Bodapati
+Masanori Ogino
 Michael Forney
+Mikhail Kremnyov
 Natanael Copa
 Nicholas J. Kain
 orc
 Pascal Cuoq
 Petr Hosek
+Petr Skocik
 Pierre Carrier
+Reini Urban
 Rich Felker
 Richard Pennington
+Samuel Holland
 Shiz
 sin
 Solar Designer
@@ -75,6 +91,7 @@ Timo Teräs
 Trutz Behn
 Valentin Ochs
 William Haddon
+William Pitcock
 
 Portions of this software are derived from third-party works licensed
 under terms compatible with the above MIT license: