Read grover API host information from a text file.
Details
The text file should contain 3 lines, the first the host address, the second the port on which it is hosted and lastly the authentication key needed
Examples
## Grover client
grover_client <- system.file('grover_client.yml',
package = 'grover')
grover_client <- readGrover(grover_client)
## Grover host
grover_host <- system.file('grover_host.yml',
package = 'grover')
grover_host <- readGrover(grover_host)