Upgrade lz4 to v2.0.7, fix stream close regression

Update README.md

Merge pull request #4 from carapace/master

add pretty badge for travis builds

add env var GO111MODULE=on

rename to .travis.yml

add travis.yml

setup go module using github.com/pierrec/lz4 v 1.0.1

comment out var meta as it was unused and failing builds

reader: close channel on async read failure

writer: add methods to store user checkpoints

writer: add ReadDB and UpdateDB methods

doc: describe usage for the incremental reportin

docs: introduced README

tests: import all the tests