updated editors/nano to 6.4

Changes between v6.3 and v6.4:
------------------------------

LIU Hao (1):
     build: ignore errors from `git describe`

Benno Schulenberg (25):
     bump version numbers and add a news item for the 6.4 release
     display: remember text and column positions when softwrapping a line
     docs: concisely describe how the linter behaves
     docs: remove the two notices about the changed defaults
     docs: rename README.GIT to README.hacking, so it's clearer what is meant
     docs: stop mentioning the obsoleted keywords that were removed
     files: designate the root directory with a simple "/", not with "//"
     formatter: instead of leaving curses, use full_refresh() to wipe messages
     gnulib: update to its current upstream state
     help: reshuffle two shortcuts so that more help-line items are paired
     options: stop accepting -z, as --suspendable has been dropped too
     po: update translations and regenerate POT file and PO files
     rcfile: remove five obsolete or deprecated keywords
     syntax: default: do not colorize a square or angle bracket after a URL
     syntax: perl: add missing keywords, and reduce the length of some lines
     syntax: python: mention an alternative linter in a comment
     tweaks: add a missing word to a news item
     tweaks: add a translator hint
     tweaks: improve a comment, and reshuffle two functions plus some lines
     tweaks: put each regex on separate line, to better show many keywords
     tweaks: rename a variable, to not be the same as a function name
     tweaks: rename two variables, to not contain the name of another
     tweaks: reshuffle a description and rewrap another
     tweaks: reshuffle a few lines, to group things better
     version: condense the copyright message, to not dominate the output

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