Add a note to CONTRIBUTING.asciidoc re build proc
Add a note to CONTRIBUTING.asciidoc re build proc

See https://github.com/elastic/elasticsearch-perl/issues/76 .

adjust/elasticsearch-perl,elastic/elasticsearch-perl,adjust/elasticsearch-perl,adjust/elasticsearch-perl,elastic/elasticsearch-perl,jeteve/elasticsearch-perl,jeteve/elasticsearch-perl,jeteve/elasticsearch-perl