> devtools::install_github('leeper/rio.db')
Downloading GitHub repo leeper/rio.db@master
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4: bit       (1.1-12 -> 1.1-14) [CRAN]
5: backports (1.1.2  -> 1.1.5 ) [CRAN]

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✔  checking for file ‘/tmp/RtmpSONxAJ/remotes175a26c2d74a/leeper-rio.db-de89584/DESCRIPTION’ (345ms)
─  preparing ‘rio.db’:
E  checking DESCRIPTION meta-information
   Malformed Depends or Suggests or Imports or Enhances field.
   Offending entries:
     Depends:
   rio
   Entries must be names of packages optionally followed by '<=' or '>=',
   white space, and a valid version number in parentheses.
   
   See section 'The DESCRIPTION file' in the 'Writing R Extensions'
   manual.
   
Error: Failed to install 'rio.db' from GitHub:
  System command error, exit status: 1, stdout + stderr (last 10 lines):
E> Malformed Depends or Suggests or Imports or Enhances field.
E> Offending entries:                                                                                                                                                                
E>   Depends:                                                                                                                                                                        
E> rio                                                                                                                                                                               
E> Entries must be names of packages optionally followed by '<=' or '>=',                                                                                                            
E> white space, and a valid version number in parentheses.                                                                                                                           
E>                                                                                                                                                                                   
E> See section 'The DESCRIPTION file' in the 'Writing R Extensions'                                                                                                                  
E> manual.                                                                                                                                                                           
E>