Make full reset of WORK_BRANCH when accept-work

`--force` is used to throw away local changes.
`-B` allows to reset branch if it already exists.

So, this change allows accepting a new work in case if previous was not
accepted (for instance, due to conflicts) by allowing recreation of
WORK_BRANCH.

docs/commands.md

@@ -140,7 +140,7 @@ usage: git elegant accept-work <remote-branch>
 A sequence of original `git` commands:
 ```bash
 git fetch --all --tags
-git checkout -b __eg <remote-branch-name>
+git checkout --force -B __eg <remote-branch-name>
 git rebase origin/master
 git checkout master
 git merge --ff-only __eg

libexec/git-elegant-accept-work

@@ -7,7 +7,7 @@ default() {
     _error-if-empty "${WORK}" "Please give a name of remote branch (like 'origin/123')."
     local WORK_BRANCH="__eg"
     boxtee git fetch --all --tags
-    boxtee git checkout -b ${WORK_BRANCH} ${WORK}
+    boxtee git checkout --force -B ${WORK_BRANCH} ${WORK}
     boxtee git rebase ${RMASTER}
     # @todo #137 Alternative flows of `accept-work`
     #  If this command is executed with `${WORK_BRANCH}` and

tests/git-elegant-accept-work.bats

@@ -9,7 +9,7 @@ teardown() {
 
 @test "'accept-work': a work is accepted successfully for given remote branch" {
     fake-pass git "fetch --all --tags"
-    fake-pass git "checkout -b __eg origin/work"
+    fake-pass git "checkout --force -B __eg origin/work"
     fake-pass git "rebase origin/master"
     fake-pass git "checkout master"
     fake-pass git "merge --ff-only __eg"