upgrade dependencies

[phanirithvij]

Allows gdu to work in tmux ($TERM == 'tmux-256color')

• gdamore/tcell@d699c7e is in tcell 2.5.0+

[coveralls]

Pull Request Test Coverage Report for Build 2679438300

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+2.0%) to 98.072%

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Totals
Change from base Build 2469752725:	2.0%
Covered Lines:	1577
Relevant Lines:	1608

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💛 - Coveralls

[codecov]

Codecov Report

Merging #153 (d20506f) into master (1a7dea1) will increase coverage by 0.25%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #153      +/-   ##
==========================================
+ Coverage   94.49%   94.74%   +0.25%     
==========================================
  Files          26       26              
  Lines        2399     2399              
==========================================
+ Hits         2267     2273       +6     
+ Misses         95       91       -4     
+ Partials       37       35       -2     

Impacted Files	Coverage Δ
report/export.go	92.40% <0.00%> (+3.79%)	⬆️

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[dundee]

Thanks for your contribution!