git: gitconfig: Use merge as default strategy for git pull

git config pull.rebase false  # merge (the default strategy)
git config pull.rebase true   # rebase
git config pull.ff only       # fast-forward only

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>

git/.gitconfig

@@ -20,3 +20,5 @@
 	keepBackup = false
 [commit]
 	verbose = true
+[pull]
+	rebase = false