Installation error
```
31 verbose Linux 4.13.0-43-generic
32 verbose argv "/usr/bin/node" "/usr/bin/npm" "i" "koa-views" "-S"
33 verbose node v8.9.4
34 verbose npm  v5.6.0
35 error Unexpected end of JSON input while parsing near '...tra","version":"0.11.'
```
