Show correct help and version

[ymtdzzz]

closes: #71

Test

Tested by pushing temporary tag and execute the released binary (v0.1.1).

$ ./otel-tui --help
Usage:
  otel-tui [flags]

Flags:
      --grpc int      The port number on which we listen for OTLP grpc payloads (default 4317)
  -h, --help          help for otel-tui
      --host string   The host where we expose our all endpoints (OTLP receivers and browser) (default "0.0.0.0")
      --http int      The port number on which we listen for OTLP http payloads (default 4318)
  -v, --version       version for otel-tui

$ ./otel-tui --version
otel-tui version 0.1.1