Bump celery from 4.2.1 to 4.3.0

Bumps [celery](https://github.com/celery/celery) from 4.2.1 to 4.3.0.
- [Release notes](https://github.com/celery/celery/releases)
- [Changelog](https://github.com/celery/celery/blob/master/Changelog)
- [Commits](https://github.com/celery/celery/compare/v4.2.1...v4.3.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Pipfile.lock

@@ -37,9 +37,9 @@
         },
         "billiard": {
             "hashes": [
-                "sha256:42d9a227401ac4fba892918bba0a0c409def5435c4b483267ebfe821afaaba0e"
+                "sha256:756bf323f250db8bf88462cd042c992ba60d8f5e07fc5636c24ba7d6f4261d84"
             ],
-            "version": "==3.5.0.5"
+            "version": "==3.6.0.0"
         },
         "blinker": {
             "hashes": [
@@ -84,11 +84,11 @@
         },
         "celery": {
             "hashes": [
-                "sha256:77dab4677e24dc654d42dfbdfed65fa760455b6bb563a0877ecc35f4cfcfc678",
-                "sha256:ad7a7411772b80a4d6c64f2f7f723200e39fb66cf614a7fdfab76d345acc7b13"
+                "sha256:4c4532aa683f170f40bd76f928b70bc06ff171a959e06e71bf35f2f9d6031ef9",
+                "sha256:528e56767ae7e43a16cfef24ee1062491f5754368d38fcfffa861cdb9ef219be"
             ],
             "index": "pypi",
-            "version": "==4.2.1"
+            "version": "==4.3.0"
         },
         "certifi": {
             "hashes": [

requirements.txt

@@ -2,10 +2,10 @@
 alembic==1.0.7
 amqp==2.4.2
 asn1crypto==0.24.0
-billiard==3.5.0.5
+billiard==3.6.0.0
 blinker==1.4
 brotli==1.0.7
-celery==4.2.1
+celery==4.3.0
 certifi==2019.3.9
 cffi==1.12.3
 chardet==3.0.4