Update git-log.md

adds the command for displaying a detailed git history of a particular file or folder
Added example of overwriting an existing link
add wall
change message to file
add env command
Add exiftool and one example
Expand git-diff page

Added:
  * `—names-only` option.
  * `—summary` option.
Add tree command docs.
README: Exilir client
Merge pull request #181 from Gubolin/master

add wall
Merge pull request #185 from naxoc/tree

Add tree command docs.
Merge pull request #182 from litblaky/master

add env command
Merge pull request #183 from tsigo/rs-exiftool

Add exiftool and one example
Merge pull request #184 from mateu-aguilo-bosch/git-diff-name-only

Expand git-diff page
Merge pull request #179 from Dahie/patch-2

Update git-log.md
Merge pull request #180 from andreassimon/patch-1

Added example of overwriting an existing link
add extraction of bzipped archive
Merge pull request #189 from Leandros/patch-1

add extraction of bzipped archive
Pages: chsh
Merge pull request #192 from Like-all/master

Pages: chsh