Create DecCoins from DecCoin

[karzak]

Summary

It should be possible to create a DecCoins from a constructor function that takes DecCoin... as inputs. Currently, the only way to do this is

[]sdk.DecCoin{sdk.DecCoin{"denom", sdk.NewDec(10)}}

Problem Definition

The current NewDecCoins method takes Coins... as arguments.

cosmos-sdk/types/dec_coin.go

Line 162 in cf46452

func NewDecCoins(coins Coins) DecCoins {

Proposal

It would be nice to have the default method take DecCoins... as arguments, or add a separate method for creating DecCoins from DecCoin...

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[fedekunze]

I'm in favor of this change. Additionally, I'd also create a NewDecCoinsFromCoin which would be the current implementation of NewDecCoins(coins Coins)