Bump flask from 0.12.2 to 1.0

Bumps [flask](https://github.com/pallets/flask) from 0.12.2 to 1.0.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/master/CHANGES.rst)
- [Commits](https://github.com/pallets/flask/compare/0.12.2...1.0)

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

requirements.txt

@@ -1,9 +1,9 @@
 click==6.7 \
     --hash=sha256:29f99fc6125fbc931b758dc053b3114e55c77a6e4c6c3a2674a2dc986016381d \
     --hash=sha256:f15516df478d5a56180fbf80e68f206010e6d160fc39fa508b65e035fd75130b
-Flask==0.12.2 \
-    --hash=sha256:0749df235e3ff61ac108f69ac178c9770caeaccad2509cb762ce1f65570a8856 \
-    --hash=sha256:49f44461237b69ecd901cc7ce66feea0319b9158743dd27a2899962ab214dac1
+Flask==1.0 \
+    --hash=sha256:b1883637bbee4dc7bc98d900792d0a304d609fce0f5bd9ca91d1b6457e5918dd \
+    --hash=sha256:7fab1062d11dd0038434e790d18c5b9133fd9e6b7257d707c4578ccc1e38b67c
 itsdangerous==0.24 \
     --hash=sha256:cbb3fcf8d3e33df861709ecaf89d9e6629cff0a217bc2848f1b41cd30d360519
 Jinja2==2.10 \