[feat] add lib/go methods: eprint, pprint

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Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.03% (target: -1.00%)	:white_check_mark: 94.87%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (eafc92916b41a8c5e45eaf9138048fe4c0b95c0f) | 4385 | 3997 | 91.15% | | | Head commit (713408d8e02c42185601b3c4f22f1e6d948dedb1) | 4424 (+39) | 4034 (+37) | 91.18% (**+0.03%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#81) | 39 | 37 | **94.87%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 92.30769% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 88.53%. Comparing base (eafc929) to head (713408d).

Files	Patch %	Lines
lib/goidiomatic/idiomatic.go	92.30%	2 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #81 +/- ## ========================================== + Coverage 88.50% 88.53% +0.03% ========================================== Files 37 37 Lines 4261 4300 +39 ========================================== + Hits 3771 3807 +36 - Misses 381 383 +2 - Partials 109 110 +1 ```

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