Security issue with github.com/gogo/protobuf version < 1.3.2

[gennadylaventman]

github.com/gogo/protobuf versions lower that 1.3.2 there is security weakness.

An issue was discovered in GoGo Protobuf before 1.3.2. plugin/unmarshal/unmarshal.go lacks certain index validation, aka the "skippy peanut butter" issue.

[gennadylaventman]

Same problem relevant to github.com/cayleygraph/quad as well.

[dennwc]

Should be fixed now. Updated to 1.3.2.