prepare release 1.4.0 (#65)

* update Makefile to meet new mandatory metadata
* update documentation
* update tags
* update authors
* bumpversion

Makefile

@@ -5,7 +5,7 @@ MANIFEST := build/collections/ansible_collections/$(NAMESPACE)/$(NAME)/MANIFEST.
 
 Roles := $(wildcard roles/*)
 PLUGIN_TYPES := $(filter-out __%,$(notdir $(wildcard plugins/*)))
-METADATA := galaxy.yml LICENSE README.md requirements.txt
+METADATA := galaxy.yml LICENSE README.md requirements.txt meta/runtime.yml
 $(foreach PLUGIN_TYPE,$(PLUGIN_TYPES),$(eval _$(PLUGIN_TYPE) := $(filter-out %__init__.py,$(wildcard plugins/$(PLUGIN_TYPE)/*.py))))
 DEPENDENCIES := $(METADATA) $(foreach PLUGIN_TYPE,$(PLUGIN_TYPES),$(_$(PLUGIN_TYPE))) $(foreach ROLE,$(ROLES),$(wildcard $(ROLE)/*/*))