Update regex to 2019.02.18 (#557)

This PR updates [regex](https://pypi.org/project/regex) from **2019.02.07** to **2019.02.18**.



*The bot wasn't able to find a changelog for this release. [Got an idea?](https://github.com/pyupio/changelogs/issues/new)*

<details>
  <summary>Links</summary>
  
  - PyPI: https://pypi.org/project/regex
  - Repo: https://bitbucket.org/mrabarnett/mrab-regex
</details>

Author: pyup-bot

requirements.txt

@@ -244,16 +244,16 @@ cryptography==2.5 \
     --hash=sha256:7d335e35306af5b9bc0560ca39f740dfc8def72749645e193dd35be11fb323b3 \
     --hash=sha256:31e5637e9036d966824edaa91bf0aa39dc6f525a1c599f39fd5c50340264e079 \
     --hash=sha256:4946b67235b9d2ea7d31307be9d5ad5959d6c4a8f98f900157b47abddf698401
-regex==2019.02.07 \
-    --hash=sha256:017bf6f893db109dc5f82b902019f6fe089e605af5e1f0f6f7271f936b411eb4 \
-    --hash=sha256:37150aee3411f38d08733edb5f3faa656f96ddae00ee7713e01d7423f0f72815 \
-    --hash=sha256:7f40b720b81f6614a34a8857d2417fbe619734629f9d0627e2cc9e493979401d \
-    --hash=sha256:72dda5123ee45cde10031576710ca0c4972757c94a60b75023a45d8069da34ca \
-    --hash=sha256:5da76d468d048fb163bcaedd5c0832a3ab95da1034598a6c673bf999ae61f259 \
-    --hash=sha256:a22a11e9dd6e46529dc4409bd6c449f3e7525aa4b0d5e9b23363302cfe4db8e4 \
-    --hash=sha256:0969fdb610435d7f49dc5518f7642d7b1319ef19f0c3f1bd4d972afbb9877aa7 \
-    --hash=sha256:3679f269790c87bd04e003e60e098b1be5392f17c48d28c2a3b9d16b3dcbca2a \
-    --hash=sha256:4a1a1d963f462c13722b34ef1f82c4707091b0a3fb9b5fd79b6670c38b734095
+regex==2019.02.18 \
+    --hash=sha256:204eb661cae77f060ec8133e5b96ba47d1531b75ff0f9ee43a0b8841467f3bfe \
+    --hash=sha256:4aa0fc3724b47c84121cc779be4da542d0b09cf648423d62d52c8cce1397d476 \
+    --hash=sha256:91af69ec1b09db8bf384508dc5108c164b4e020f857aa5c124334c078d387baf \
+    --hash=sha256:9e0cce32ac5dc3a8d1ed7f302f4e0b29c22f4c0c1130e7e73f4e13aa73207599 \
+    --hash=sha256:a6d4ac6c806ea918659a9eae6f4356ffc58b400ee8856d8b4019ff7df02d25ff \
+    --hash=sha256:beb4110192b1aec2923e86d991dbff4bd599de4aee732d1197aba9bb9cbb4b29 \
+    --hash=sha256:eb471ab4e82f1883c7e1001a81be06ff1271ac54fa73c38ca1f198d4892c1132 \
+    --hash=sha256:eee9f554a6119d8de098510a2ce243edda9d69bd13b4a1ba5cd94018a3222078 \
+    --hash=sha256:f39b7e56ad5b194eec5d22cac95d0feebeea43d5967bd8bfbefef402c0821c8c
 cffi==1.12.0 \
     --hash=sha256:e5eb00a6e1058806a41e3f5a30e4c826ec97d98957302c78909fb8ee98d0266e \
     --hash=sha256:830831d20030c17d62b7ca3987a09f02c193ff2d2c46dc0dff53d89071dd806e \