Change default environment to 'development'

[st0012]

Most people use development instead of default as their default environment. This change should prevent other issues similar to #1559.

Closes #1559

[codecov-commenter]

Codecov Report

Merging #1565 (92c5a14) into master (d475015) will decrease coverage by 2.12%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1565      +/-   ##
==========================================
- Coverage   97.92%   95.79%   -2.13%     
==========================================
  Files         222      110     -112     
  Lines       10870     6093    -4777     
==========================================
- Hits        10644     5837    -4807     
- Misses        226      256      +30     

Impacted Files	Coverage Δ
sentry-ruby/lib/sentry/configuration.rb	97.96% <100.00%> (-0.07%)	⬇️
sentry-ruby/spec/sentry/configuration_spec.rb	98.42% <100.00%> (ø)
sentry-ruby/spec/sentry_spec.rb	99.72% <100.00%> (-0.01%)	⬇️
.../lib/sentry/rails/rescued_exception_interceptor.rb	28.57% <0.00%> (-71.43%)	⬇️
sentry-rails/lib/sentry/rails/railtie.rb	27.86% <0.00%> (-68.86%)	⬇️
sentry-rails/app/jobs/sentry/send_event_job.rb	18.75% <0.00%> (-68.75%)	⬇️
...ls/lib/sentry/rails/tracing/abstract_subscriber.rb	34.61% <0.00%> (-61.54%)	⬇️
sentry-rails/lib/sentry/rails/tracing.rb	35.48% <0.00%> (-61.30%)	⬇️
...entry-rails/lib/sentry/rails/capture_exceptions.rb	36.00% <0.00%> (-60.00%)	⬇️
sentry-rails/lib/sentry/rails/backtrace_cleaner.rb	47.05% <0.00%> (-52.95%)	⬇️
... and 156 more

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