Bump Git version requirement to 2.8.4

Signed-off-by: Rémy Coutable <remy@rymai.me>

README.md

@@ -76,7 +76,7 @@ GitLab is a Ruby on Rails application that runs on the following software:
 - Ubuntu/Debian/CentOS/RHEL
 - Ruby (MRI) 2.3
-- Git 2.7.4+
+- Git 2.8.4+
 - Redis 2.8+
 - MySQL or PostgreSQL

changelogs/unreleased/update-git-version-in-doc.yml

+---
+title: Bump Git version requirement to 2.8.4
+merge_request: 
+author: 

doc/install/installation.md

@@ -76,7 +76,7 @@ Make sure you have the right version of Git installed
     # Install Git
     sudo apt-get install -y git-core
-    # Make sure Git is version 2.7.4 or higher
+    # Make sure Git is version 2.8.4 or higher
     git --version
 Is the system packaged Git too old? Remove it and compile from source.
@@ -89,9 +89,9 @@ Is the system packaged Git too old? Remove it and compile from source.
     # Download and compile from source
     cd /tmp
-    curl --remote-name --progress https://www.kernel.org/pub/software/scm/git/git-2.7.4.tar.gz
-    echo '7104c4f5d948a75b499a954524cb281fe30c6649d8abe20982936f75ec1f275b  git-2.7.4.tar.gz' | shasum -a256 -c - && tar -xzf git-2.7.4.tar.gz
-    cd git-2.7.4/
+    curl --remote-name --progress https://www.kernel.org/pub/software/scm/git/git-2.8.4.tar.gz
+    echo '626e319f8a24fc0866167ea5f6bf3e2f38f69d6cb2e59e150f13709ca3ebf301  git-2.8.4.tar.gz' | shasum -a256 -c - && tar -xzf git-2.8.4.tar.gz
+    cd git-2.8.4/
     ./configure
     make prefix=/usr/local all