refactor README.md

Merge pull request #83 from sendpulse/change_readme

change_readme

Merge pull request #82 from sendpulse/change_readme

Change readme

Merge pull request #81 from sendpulse/new_major_vesion

New major vesion

Merge pull request #78 from sendpulse/bg-40640_check_routes

fix api path

Merge pull request #73 from sendpulse/add_event_method

add doc automation360 method

Merge pull request #72 from sendpulse/add_a360_client

add Automation360 client

Merge pull request #71 from sendpulse/create_campaign_with_attachment…

…s_binary

create campaign with attachments binary

Merge pull request #68 from sendpulse/resolve_smtpSendMail

fixed  resend smtp

add current response smtpSendEmail