Fixed a wiki link reference in the main README
Fixed a wiki link reference in the main README

eHealthAfrica/formhub,ehealthafrica-ci/formhub,eHealthAfrica/formhub,ehealthafrica-ci/formhub,ehealthafrica-ci/formhub,eHealthAfrica/formhub,eHealthAfrica/formhub,ehealthafrica-ci/formhub