fix duplicates in llvm dev meetings (#42)

Author: pranavkalpathishankar

data/events.yml

@@ -233,42 +233,6 @@ events:
     url: "/devmtg/2011-11/"
     event_site: "https://llvm.org/devmtg/2011-11/"
 
-  - name: "European Conference"
-    id: "2012-04"
-    start_date: "2012-04-12"
-    end_date: "2012-04-12"
-    description: "2012 European Conference"
-    location: "Hotel Russell, 1-8 Russell Square, Bloomsbury, London, WC1B 5BE, UK"
-    url: "/devmtg/2012-04/"
-    event_site: "https://llvm.org/devmtg/2012-04/"
-    
-  - name: "LLVM Developers' Meeting"
-    id: "2012-11"
-    start_date: "2012-11-07"
-    end_date: "2012-11-08"
-    description: "2012 LLVM Developers' Meeting"
-    location: "Fairmont, 170 South Market Street, San Jose, CA"
-    url: "/devmtg/2012-11/"
-    event_site: "https://llvm.org/devmtg/2012-11/"
-
-  - name: "European Conference"
-    id: "2012-04"
-    start_date: "2012-04-12"
-    end_date: "2012-04-12"
-    description: "2012 European Conference"
-    location: "Hotel Russell, 1-8 Russell Square, Bloomsbury, London, WC1B 5BE, UK"
-    url: "/devmtg/2012-04/"
-    event_site: "https://llvm.org/devmtg/2012-04/"
-
-  - name: "LLVM Developers' Meeting"
-    id: "2011-11"
-    start_date: "2011-11-18"
-    end_date: "2011-11-18"
-    description: "2011 LLVM Developers' Meeting"
-    location: "San Jose Marriott, 301 South Market Street, San Jose, CA"
-    url: "/devmtg/2011-11/"
-    event_site: "https://llvm.org/devmtg/2011-11/"
-
   - name: "European User Group Meeting"
     id: "2011-09"
     start_date: "2011-09-16"