Update sources.json

Added myself as contributor to erfurter-bahn, hvv-akn, metronom, nrw-regional and vbg.

Author: oneiricbotcelot

sources.json

@@ -321,6 +321,9 @@
         "contributors": [
             {
                 "github": "verbuchselt"
+            },
+            {
+                "github": "oneiricbotcelot"
             }
         ],
         "sources": [
@@ -390,6 +393,9 @@
             },
             {
                 "github": "jheubuch"
+            },
+            {
+                "github": "oneiricbotcelot"
             }
         ],
         "sources": [
@@ -600,6 +606,9 @@
         "contributors": [
             {
                 "github": "lunas-bad-coding"
+            },
+            {
+                "github": "oneiricbotcelot"
             }
         ],
         "sources": [
@@ -845,6 +854,9 @@
             },
             {
                 "github": "marhei"
+            },
+            {
+                "github": "oneiricbotcelot"
             }
         ],
         "sources": [
@@ -1459,6 +1471,9 @@
         "contributors": [
             {
                 "github": "feuer1998"
+            },
+            {
+                "github": "oneiricbotcelot"
             }
         ],
         "sources": [