Update README.md

README.md

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 # kak-fetch
+
+Like [vim-fetch](https://github.com/wsdjeg/vim-fetch), but for [kakoune](https://kakoune.org).
+Understands different schemes used to indicate file, line, column and jumps to the line+column of the file.
+
+### Currently known schemes
+
+#### trailing colon
+
+`$file:lnum[:colnum[:]]`
+
+#### trailing parentheses
+
+`$file(lnum[:colnum])`
+
+#### trailing equals
+
+`$file=lnum=`
+
+#### trailing dash
+
+`$file-lnum-`
+
+#### Plan 9 type line spec
+
+`$file[:]#lnum`