Remove date-time format for String fields such as url, content_url, project_url, etc. (singer-io#72)

* Removed format date-time for html_url field

* Remove date-time format for all these fields

Author: KAllan357

tap_github/commit_comments.json

@@ -14,8 +14,7 @@
         "type": [
           "null",
           "string"
-        ],
-        "format": "date-time"
+        ]
       },
       "id": {
         "type": [

tap_github/issue_milestones.json

@@ -8,8 +8,7 @@
         "type": [
           "null",
           "string"
-        ],
-        "format": "date-time"
+        ]
       },
       "html_url": {
         "type": [

tap_github/project_cards.json

@@ -8,8 +8,7 @@
         "type": [
           "null",
           "string"
-        ],
-        "format": "date-time"
+        ]
       },
       "id": {
         "type": [
@@ -73,22 +72,19 @@
         "type": [
           "null",
           "string"
-        ],
-        "format": "date-time"
+        ]
       },
       "content_url": {
         "type": [
           "null",
           "string"
-        ],
-        "format": "date-time"
+        ]
       },
       "project_url": {
         "type": [
           "null",
           "string"
-        ],
-        "format": "date-time"
+        ]
       }
     }
   }

tap_github/project_columns.json

@@ -8,15 +8,13 @@
         "type": [
           "null",
           "string"
-        ],
-        "format": "date-time"
+        ]
       },
       "project_url": {
         "type": [
           "null",
           "string"
-        ],
-        "format": "date-time"
+        ]
       },
       "cards_url": {
         "type": [

tap_github/projects.json

@@ -20,8 +20,7 @@
         "type": [
           "null",
           "string"
-        ],
-        "format": "date-time"
+        ]
       },
       "columns_url": {
         "type": [

tap_github/pull_request_reviews.json

@@ -167,8 +167,7 @@
         "type": [
           "null",
           "string"
-        ],
-        "format": "date-time"
+        ]
       },
       "_links": {
         "type": [