Version bump 2.26.1 (#1489)

* Version bump 2.26.1

We extended format accepted by `--read-interface` option, which requires
updating the minor version.

* Update documentation of --read-interface option

doc/invoking.rst

@@ -58,6 +58,7 @@ The following options are available:
             --read-interface=<docpath>,<file>
             -i <docpath>,<srcpath>,<file>
             --read-interface=<docpath>,<srcpath>,<file>
+            -i <docpath>,<srcpath>,<visibility>,<file>
 
     Read the interface file in file, which must have been produced by
     running Haddock with the :option:`--dump-interface` option. The interface
@@ -77,6 +78,9 @@ The following options are available:
     hyperlinks but within sources rendered with :option:`--hyperlinked-source`
     option.
 
+    If visibility is set to `hidden`, modules from that interface file will
+    not be listed in haddock generated content file.
+
     Multiple :option:`--read-interface` options may be given.
 
 .. option:: -D <file>

haddock-api/haddock-api.cabal

 cabal-version:        2.0
 name:                 haddock-api
-version:              2.26.0
+version:              2.26.1
 synopsis:             A documentation-generation tool for Haskell libraries
 description:          Haddock is a documentation-generation tool for Haskell
                       libraries

haddock.cabal

@@ -150,7 +150,7 @@ executable haddock
   else
     -- in order for haddock's advertised version number to have proper meaning,
     -- we pin down to a single haddock-api version.
-    build-depends:  haddock-api == 2.26.0
+    build-depends:  haddock-api == 2.26.1
 
 test-suite html-test
   type:             exitcode-stdio-1.0