Bump Git version requirement to 2.7.4 (for 8.2)

CHANGELOG

 Please view this file on the master branch, on stable branches it's out of date.
 
+v 8.2.4
+  - Bump Git version requirement to 2.7.4
+
 v 8.2.3
   - Fix application settings cache not expiring after changes (Stan Hu)
   - Fix Error 500s when creating global milestones with Unicode characters (Stan Hu)

README.md

@@ -70,7 +70,7 @@ GitLab is a Ruby on Rails application that runs on the following software:
 
 - Ubuntu/Debian/CentOS/RHEL
 - Ruby (MRI) 2.1
-- Git 1.7.10+
+- Git 2.7.4+
 - Redis 2.4+
 - MySQL or PostgreSQL
 

doc/install/installation.md

@@ -75,7 +75,7 @@ Make sure you have the right version of Git installed
     # Install Git
     sudo apt-get install -y git-core
 
-    # Make sure Git is version 1.7.10 or higher, for example 1.7.12 or 2.0.0
+    # Make sure Git is version 2.7.4 or higher
     git --version
 
 Is the system packaged Git too old? Remove it and compile from source.
@@ -88,8 +88,9 @@ Is the system packaged Git too old? Remove it and compile from source.
 
     # Download and compile from source
     cd /tmp
-    curl -L --progress https://www.kernel.org/pub/software/scm/git/git-2.4.3.tar.gz | tar xz
-    cd git-2.4.3/
+    curl -O --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/
     ./configure
     make prefix=/usr/local all