SRCH-1931 Update bundler (#83)

Bumped bundler up to 2.2.15 and updated CircleCI config.

Author: jmax-fearless

.circleci/config.yml

@@ -35,7 +35,7 @@ jobs:
             cp -p config/instagram.yml.example config/instagram.yml
       - restore_cache:
           key: bundle-{{ checksum "Gemfile.lock" }}
-      - run: gem install bundler:1.17.3
+      - run: gem install bundler:2.2.15
       - run:
           name: bundle install
           command: |

Gemfile.lock

@@ -412,4 +412,4 @@ DEPENDENCIES
   whenever (~> 0.9.4)
 
 BUNDLED WITH
-   1.17.3
+   2.2.15