Enable usage of multiple '{{here}}' placeholder in a custom template

[AdrieanKhisbe]

as commit says :)

Here is the custom template I want to be able to support:

{
            "name": "ll",
            "description": "detailed log",
            "body": "console.log('{{expr}}', {{expr}});$0",
            "when": [
                "expression"
            ]
        }

I added test for the fixtures + Implementation is rather simple, feeding a global regexp to replace

[codecov[bot]]

Codecov Report

Merging #14 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff           @@
##           master     #14   +/-   ##
======================================
  Coverage    99.3%   99.3%           
======================================
  Files          13      13           
  Lines         289     289           
  Branches       54      54           
======================================
  Hits          287     287           
  Misses          2       2

Impacted Files	Coverage Δ
src/completionItemBuilder.ts	100% <100%> (ø)	:arrow_up:

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[AdrieanKhisbe]

Thanks @ipatalas 😃