Contract test [GET] (#19)

Closes: #17
Depends on: cosmos/cosmos-sdk#4470

contrib/get_node.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+VERSION=v11.15.0
+NODE_FULL=node-${VERSION}-linux-x64
+
+mkdir -p ~/.local/bin
+mkdir -p ~/.local/node
+wget http://nodejs.org/dist/${VERSION}/${NODE_FULL}.tar.gz -O ~/.local/node/${NODE_FULL}.tar.gz
+tar -xzf ~/.local/node/${NODE_FULL}.tar.gz -C ~/.local/node/
+ln -s ~/.local/node/${NODE_FULL}/bin/node ~/.local/bin/node
+ln -s ~/.local/node/${NODE_FULL}/bin/npm ~/.local/bin/npm
+export PATH=~/.local/bin:$PATH
+npm i -g dredd@11.0.1
+ln -s ~/.local/node/${NODE_FULL}/bin/dredd ~/.local/bin/dredd