GoLint fixes

[Dexus]

GoLint + Logger

Delete file-logger

Changes to be committed:
    modified:   README.md
    modified:   _examples/advanced/url-shortener/main.go
    deleted:    _examples/beginner/file-logger/main.go
    modified:   _examples/beginner/overview/main.go
    modified:   _examples/beginner/routing/basic/main.go
    modified:   _examples/intermediate/custom-context/method-overriding/main.go
    modified:   _examples/intermediate/subdomains/www/main.go
    modified:   _examples/intermediate/view/context-view-data/main.go
    modified:   _examples/intermediate/websockets/secure/main.go
    modified:   configuration.go
    modified:   context/context.go
    modified:   core/host/world.go
    modified:   core/router/api_builder.go
    modified:   core/router/fs.go
    modified:   core/router/status.go
    modified:   coverage-tests/siris_query_test.go
    modified:   sessions/sess_cookie_test.go
    modified:   sessions/sess_file_test.go
    modified:   sessions/sess_mem_test.go
    modified:   sessions/session.go
    modified:   sessions/sessions.go
    modified:   siris.go
    modified:   siris_deprecated.go

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This change is 

[codecov[bot]]

Codecov Report

Merging #58 into devel will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##            devel      #58   +/-   ##
=======================================
  Coverage   62.49%   62.49%           
=======================================
  Files          23       23           
  Lines        1925     1925           
=======================================
  Hits         1203     1203           
  Misses        632      632           
  Partials       90       90

Impacted Files	Coverage Δ
core/host/world.go	75% <ø> (ø)	:arrow_up:
sessions/session.go	72.77% <ø> (ø)	:arrow_up:

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