Update all - asldsajflask

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
github.com/cenkalti/backoff	require	minor	v2.1.1+incompatible -> v2.2.0	source
github.com/gotestyourself/gotestyourself	require	minor	v2.2.0+incompatible -> v2.3.0	source
github.com/lib/pq	require	patch	v1.1.0 -> v1.1.1	source
github.com/prometheus/common	require	minor	v0.3.0 -> v0.4.0	source
github.com/prometheus/procfs	require	digest	v0.0.0-20190425082905-87a4384529e0 -> v0.0.0-20190425082905-87a4384529e0@5867b95	source
golang.org/x/net	require	digest	v0.0.0-20190501004415-9ce7a6920f09 -> v0.0.0-20190501004415-9ce7a6920f09@a4d6f7f	source
golang.org/x/sys	require	digest	v0.0.0-20190429190828-d89cdac9e872 -> v0.0.0-20190429190828-d89cdac9e872@a5b02f9	source
gotest.tools	require	minor	v2.2.0+incompatible -> v2.3.0	source

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Release Notes

lib/pq

### [`v1.1.1`](https://togithub.com/lib/pq/releases/v1.1.1) [Compare Source](https://togithub.com/lib/pq/compare/v1.1.0...v1.1.1) - Fix parsing of FLOAT4 types.

prometheus/common

### [`v0.4.0`](https://togithub.com/prometheus/common/releases/v0.4.0) [Compare Source](https://togithub.com/prometheus/common/compare/v0.3.0...v0.4.0) v0.4.0

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[codecov-io]

Codecov Report

Merging #22 into master will decrease coverage by 20.86%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           master      #22       +/-   ##
===========================================
- Coverage   64.22%   43.35%   -20.87%     
===========================================
  Files          12        7        -5     
  Lines         900      459      -441     
===========================================
- Hits          578      199      -379     
+ Misses        229      222        -7     
+ Partials       93       38       -55

Impacted Files	Coverage Δ
cmd/server/account_storage_qledger.go	7.22% <0%> (-84.59%)	:arrow_down:
cmd/server/accounts.go	60.49% <0%> (-2.14%)	:arrow_down:
cmd/server/account_storage.go	0% <0%> (ø)	:arrow_up:
cmd/server/http.go	100% <0%> (ø)	:arrow_up:
cmd/server/sqlite.go	68.96% <0%> (ø)	:arrow_up:
cmd/server/transactions.go
cmd/server/transaction_storage.go
cmd/server/transaction_storage_sqlite.go
cmd/server/account_storage_sqlite.go
cmd/server/transaction_storage_qledger.go
... and 1 more

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