renamed invertcolors to dark colors and added info in README.md

README.md

@@ -66,6 +66,7 @@ the slides, i.e.
   in following format: #current/#total. By default, just current page number is
   printed.
 * Option `noslidenumbers` omits slide numbers entirely.
+* Option `darkcolors` makes the background dark and the foreground light.
 
 #### Color customization
 

beamercolorthememetropolis.sty

@@ -22,13 +22,13 @@
 % Options
 % =======
 
-% Option: invertcolors
+% Option: darkcolors
 %         makes the background dark and the foreground light
 
-\newif\if@beamer@metropolis@invertcolors
-\@beamer@metropolis@invertcolorsfalse
-\DeclareOptionBeamer{invertcolors}{
-    \@beamer@metropolis@invertcolorstrue
+\newif\if@beamer@metropolis@darkcolors
+\@beamer@metropolis@darkcolorsfalse
+\DeclareOptionBeamer{darkcolors}{
+    \@beamer@metropolis@darkcolorstrue
 }
 
 % Option: ...
@@ -69,7 +69,7 @@
 % in your preamble.
 %
 
-\if@beamer@metropolis@invertcolors
+\if@beamer@metropolis@darkcolors
   \setbeamercolor{normal text}{%
     fg=black!2,
     bg=mDarkTeal

beamerthemem.sty

@@ -81,11 +81,11 @@
   \PassOptionsToPackage{blockbg}{beamercolorthememetropolis}%
 }
 
-% Option: invertcolors
+% Option: darkcolors
 %         makes the background dark and the foreground light
 
-\DeclareOptionBeamer{invertcolors}{
-  \PassOptionsToPackage{invertcolors}{beamercolorthememetropolis}%
+\DeclareOptionBeamer{darkcolors}{
+  \PassOptionsToPackage{darkcolors}{beamercolorthememetropolis}%
 }
 
 % Option: ...