[nongnu] elpa/pdf-tools updated (5b1c367f36 -> 5621164d47)

[ELPA Syncer]

elpasync pushed a change to branch elpa/pdf-tools.

      from  5b1c367f36 Clean up NEWS and prepare for a v0.91 release
       new  b0f01a9031 Reset slice when auto-slice is turned off
       new  91afc4f87b Use `l` and `r` for backward / forward in history.
       new  5621164d47 Clean up installation instructions in the README


Summary of changes:
 README.org          | 317 ++++++++++++++++++++--------------------------------
 lisp/pdf-history.el |   2 +
 lisp/pdf-view.el    |  18 +--
 3 files changed, 131 insertions(+), 206 deletions(-)