Upgraded Go version and dependencies (lalamove#63)

* Upgraded Go version and dependencies
- upgraded to Go v1.14
- upgraded dependencies to latest versions
- dropped toml files
- updated Go versions in .travis.yml

* Removed deprecated `dep` dependency management tool from build pipeline

Create Store in a thread safe manner (lalamove#60)

* create Store in a thread safe manner

update go-micro dependencies (lalamove#57)

* update dependencies

Adding BindStructStrict to strictly bind struct keys to config store (l…

…alamove#56)

Merge pull request lalamove#53 from lalamove/lint

lint ineffassign

Merge pull request lalamove#49 from lalamove/fix/vault-kv-version2

Fix/vault kv version2

Adding KV v2 support for Vault

Merge pull request lalamove#45 from lalamove/feature/max-watcher-panics

Add recovery on panics in watcher and add a MaxWatcherPanics setting

Merge pull request lalamove#43 from xakep666/feature/klenv-parse-stri…

…ng-slices

Add string slice parsing logic to `klenv` loader.

Merge pull request lalamove#44 from lalamove/feature/ttl-ratio

make vault loader's TTL ratio configurable