go module support, github workflow, new gorelease template, arm support

[chandanpasunoori]

• updated to newer goreleaser template
• added support to apple silicon and arm64 builds
• added github workflow action and removed travis for easy integration
• updated to go module

[chandanpasunoori]

apple silicon(m1 max)

./dist/jaggr_darwin_arm64/jaggr -h
Usage: jaggr [OPTIONS] FIELD_DEF [FIELD_DEF...]:

OPTIONS:
  -interval duration
    	Sampling interval (default 1s)
  -version
    	Show version

FIELD_DEF: <aggr>[,<aggr>...]:path[=alias]
  aggr:
    - min, max, mean: Computes the min, max, mean of the field's values during the sample interval.
    - median, p#: The p1 to p99 compute the percentile of the field's values during the sample interval.
    - sum: Sum all values for the field.
    - [bucket1,bucketN]hist: Count number of values between bucket and bucket+1.
    - [bucket1,bucketN]cat: Count number of values equal to the define buckets (can be non-number values). The special `*` matches values that fit in none of the defined buckets.
  path:
    JSON field path (eg: field.sub-field).
  alias:
    Optional name to use instead of the field path on the output.
    
    
./dist/jaggr_darwin_arm64/jaggr -version
1.1.0

[chandanpasunoori]

fixes #2

[chandanpasunoori]

@rs can you please add tag 1.1.0 or may be 1.0.1 so that git workflow will run and creates release assets, you may require to add GITHUB_TOKEN secret in https://github.com/settings/tokens

https://github.com/chandanpasunoori/jaggr/releases/tag/1.1.0

[chandanpasunoori]

@rs when you get time please check #3 (comment)