Update key names for consistency

data/events.yml

@@ -1,60 +1,60 @@
 events:
-    drupal-bristol:
+    drupal_bristol:
         name: Drupal Bristol
         location: Bristol, UK
         url: https://www.drupalbristol.org.uk
 
-    drupal-dev-days-2018:
+    drupal_dev_days_18:
         name: Drupal Dev Days 2018
         location: Lisbon, Portugal
         url: http://lisbon2018.drupaldays.org
 
-    drupal-somerset:
+    drupal_somerset:
         name: Drupal Somerset
         location: Glastonbury, UK
 
-    drupalcamp-brighton-15:
+    drupalcamp_brighton_15:
         name: DrupalCamp Brighton 2015
         location: Brighton, UK
 
-    drupalcamp-bristol-16:
+    drupalcamp_bristol_16:
         name: DrupalCamp Bristol 2016
         location: Bristol, UK
         url: https://2016.drupalcampbristol.org.uk
 
-    drupalcamp-dublin-17:
+    drupalcamp_dublin_17:
         name: DrupalCamp Dublin 2017
         location: Dublin, Ireland
         url: http://2017.drupal.ie
 
-    drupalcamp-london-14:
+    drupalcamp_london_14:
         name: DrupalCamp London 2014
         location: London, UK
 
-    drupalcamp-london-15:
+    drupalcamp_london_15:
         name: DrupalCamp London 2015
         location: London, UK
 
-    drupalcamp-london-16:
+    drupalcamp_london_16:
         name: DrupalCamp London 2016
         location: London, UK
 
-    drupalcamp-london-17:
+    drupalcamp_london_17:
         name: DrupalCamp London 2017
         location: London, UK
         url: http://drupalcamp.london
 
-    drupalcamp-london-18:
+    drupalcamp_london_18:
         name: DrupalCamp London 2018
         location: London, UK
         url: http://drupalcamp.london
 
-    drupalcamp-north-15:
+    drupalcamp_north_15:
         name: DrupalCamp North 2015
         location: Sunderland, UK
         url: http://drupalcampnorth.org
 
-    nomad-php:
+    nomad_php:
         name: Nomad PHP
         location: Online
         url: https://nomadphp.com
@@ -64,12 +64,12 @@ events:
         location: Manchester, UK
         url: http://nwdrupal.org.uk
 
-    phpnw17:
+    phpnw_17:
         name: PHP North West 2017
         location: Manchester, UK
         url: http://conference.phpnw.org.uk/phpnw17
 
-    phpsc16:
+    php_south_coast_16:
         name: PHP South Coast 2016
         location: Portsmouth, UK
         url: http://2016.phpsouthcoast.co.uk
@@ -79,7 +79,7 @@ events:
         location: Bristol, UK
         url: https://phpsw.uk
 
-    phpuk18:
+    php_uk_18:
         name: PHP UK Conference 2018
         location: London, UK
         url: https://www.phpconference.co.uk
@@ -93,7 +93,7 @@ events:
         location: Bristol, UK
         url: http://umbristol.co.uk
 
-    unifieddiff:
+    unified_diff:
         name: 'unified.diff'
         location: Cardiff, UK
         url: http://unifieddiff.co.uk