database has been removed

vouch#240 upgrade to go 1.13

Merge branch 'pr/jbwtan/214'

Merge branch 'pr/oferrigni/234'

Merge branch 'pr/Dobli/218'

Merge branch 'pr/eikehartmann/205'

Merge branch 'master' into pr/eikehartmann/199

Merge branch 'pr/nolta/177'

fix vouch#185 ignore JSON for User.ID

convert int to string