[elpa] externals/denote updated (7a2034516e -> c68e9bee1e)

[ELPA Syncer]

elpasync pushed a change to branch externals/denote.

      from  7a2034516e Fix denote-add-front-matter code for signature value
       new  f89f9ee963 Make denote-date-prompt accept optional INITIAL-DATE and 
PROMPT-TEXT
       new  a89755c686 Add denote-file-has-denoted-filename-p function
       new  26629820f7 Refactor denote-retrieve-title-or-filename
       new  5ae74c1158 Change the way denote--used-ids is used
       new  63a6603b62 Merge pull request #491 from 
jeanphilippegg/denote-retrieve-title-or-filename
       new  c68e9bee1e Mention denote-file-has-denoted-filename-p in the manual


Summary of changes:
 README.org           |  26 +++++++++---
 denote.el            | 109 +++++++++++++++++++++++++++++++++++++++------------
 tests/denote-test.el |  19 +++++++++
 3 files changed, 124 insertions(+), 30 deletions(-)