add --pull flag for podman create&run

Requirement from https://github.com/containers/libpod/issues/3575#issuecomment-512238393

Added --pull for podman create and pull to match the newly added flag in docker CLI.
`missing`: default value, podman will pull the image if it does not exist in the local.
`always`: podman will always pull the image.
`never`: podman will never pull the image.

Signed-off-by: Qi Wang <qiwan@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/API.md b/API.md
index d468ba53d..2399a7eb0 100755
--- a/API.md
+++ b/API.md
@@ -1501,6 +1501,8 @@ publish [?[]string](#?[]string)
 
 publishAll [?bool](#?bool)
 
+pull [?string](#?string)
+
 quiet [?bool](#?bool)
 
 readonly [?bool](#?bool)