Update README.md (#1672)
Update README.md (#1672)

How to raise the default and maximum number of posts to be returned in result set from REST API. Workaround for https://github.com/gatsbyjs/gatsby/issues/1647.
mingaldrichgan/gatsby,mickeyreiss/gatsby,fk/gatsby,0x80/gatsby,chiedo/gatsby,chiedo/gatsby,ChristopherBiscardi/gatsby,mickeyreiss/gatsby,ChristopherBiscardi/gatsby,ChristopherBiscardi/gatsby,danielfarrell/gatsby,danielfarrell/gatsby,fabrictech/gatsby,0x80/gatsby,gatsbyjs/gatsby,danielfarrell/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,mickeyreiss/gatsby,Khaledgarbaya/gatsby,Khaledgarbaya/gatsby,gatsbyjs/gatsby,fabrictech/gatsby,mingaldrichgan/gatsby,chiedo/gatsby,0x80/gatsby,mingaldrichgan/gatsby,fk/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,fabrictech/gatsby,fk/gatsby,gatsbyjs/gatsby,Khaledgarbaya/gatsby