Auto merge of #6136 - r0e:master, r=mbrubeck
Auto merge of #6136 - r0e:master, r=mbrubeck

Fixes issue #6112 
update-cargo and cargo-update both require that the user specifies the "-p" flag along with a specified package OR specify the "-a" flag to update all packages.

Let me know if this is not the right functionality.

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