Update README.md

typo
[FEATURE] Add listIncomingPayments to cli/index.
[BUG] namespace list_incoming_payments under api.
[BUG] namespace list_outgoing_payments under api.
[CHORE] Remove unnecessary ripple rest client object.
[FEATURE] Add listUserExternalAccounts
[BUG] Do not call getKey function on export.
[CHORE] Update domain to DOMAIN in config.
[FEATURE] Add listUserExternalAccounts api call to http.
[FEATURE] Add add_external_account cli function.
[CHORE] Update ripple.txt.
[CHORE] Remove /api prefix from routes.
[CHORE] Bump minor version.
[CHORE] Bump minor version of weball dependency.
Merge pull request #75 from atlanticstarr1/master

Prefixed gateway function calls with 'api'
Merge pull request #72 from hmalmedal/patch-1

Update README.md
Merge branch 'master' of github.com:ripple/ripple-gateway
[FEATURE] Mark payment errors as failed.
[CHORE] Bump data backend dependency version.
[FEATURE] Add activateUser, deactivateUser.