Updated documentation regarding gamma correction

Makefile

@@ -1,4 +1,4 @@
-VERSION   := git-20150106
+VERSION   := git-20150107
 
 PREFIX    := /usr/local
 MANPREFIX := $(PREFIX)/share/man

README.md

@@ -108,6 +108,8 @@ of small previews is displayed, making it easy to choose an image to open.
     Ctrl-m       Remove all image marks
     N            Go [count] marked images forward
     P            Go [count] marked images backward
+    {,}          Decrease/increase gamma correction by [count] steps
+    Ctrl-g       Reset gamma correction
 
 *Thumbnail mode:*
 
@@ -133,8 +135,6 @@ of small previews is displayed, making it easy to choose an image to open.
     <,>          Rotate image (counter-)clockwise by 90 degrees
     ?            Rotate image by 180 degrees
     |,_          Flip image horizontally/vertically
-    {,}          Decrease/increase gamma
-    Ctrl-g       Reset gamma
     a            Toggle anti-aliasing
     A            Toggle visibility of alpha-channel, i.e. transparency
     s            Toggle slideshow or set delay to [count] seconds

sxiv.1

@@ -164,6 +164,19 @@ marked images forward.
 Go
 .I count
 marked images backward.
+.TP
+.B {
+Decrease gamma correction by
+.I count
+steps.
+.TP
+.B }
+Increase gamma correction by
+.I count
+steps.
+.TP
+.B Ctrl-g
+Reset gamma correction.
 .SH THUMBNAIL KEYBOARD COMMANDS
 The following keyboard commands are only available in thumbnail mode:
 .TP
@@ -289,16 +302,6 @@ Flip image horizontally.
 .TP
 .B _
 Flip image vertically.
-.SS Gamma Correction
-.TP
-.B {
-Decrease gamma.
-.TP
-.B }
-Increase gamma.
-.TP
-.B Ctrl-g
-Reset gamma.
 .SS Miscellaneous
 .TP
 .B a