hledger 1.21

Only display out-of-date packages.

6 Reverse deps	Accepted versions
buchhaltung	>=1.1
hledger-api	>=1.14 && <1.15
hledger-chart	==0.16.1
hledger-ui	>=1.21 && <1.22
hledger-vty	==0.16.1
hledger-web	==1.21.*