Fix gem path. It closes #1

Author: jonatas

examples/04_timescale/timescale_setup.rb

@@ -2,7 +2,7 @@
 
 gemfile(true) do
   source 'https://rubygems.org'
-  gem 'timescaledb', path: '../timescale-gem'
+  gem 'timescaledb'
   gem 'pg'
   gem 'activerecord'
   gem 'pry'
@@ -151,4 +151,4 @@ def generate_sample_data(total: 1000, time: 1.month.ago)
 pp Measurement.hypertable.detailed_size
 
 puts "\nCompression statistics:"
-pp Measurement.hypertable.compression_stats 
+pp Measurement.hypertable.compression_stats