Relaxed required versions of all our dependencies

Some packages were upgraded; the rename from `CommonMark` to `commonmark`
was the only change breaking the unit tests.

pyproject.toml

@@ -16,42 +16,39 @@ translations = 'pillar.cli.translations:main'
 
 [tool.poetry.dependencies]
 python = "~3.6"
-attrs = "18.2.0"
-algoliasearch = "1.12.0"
-bcrypt = "3.1.3"
-blinker = "1.4"
-bleach = "2.1.3"
-celery = {version = "=4.2.1",extras = ["redis"]}
-CommonMark = "0.7.2"
-elasticsearch = "6.1.1"
-elasticsearch-dsl = "6.1.0"
-Eve = "0.8"
-Flask = "1.0.2"
-Flask-Babel = "0.11.2"
-Flask-Caching = "1.4.0"
-Flask-DebugToolbar = "0.10.1"
-Flask-Script = "2.0.6"
-Flask-Login = "0.4.1"
-Flask-WTF = "0.14.2"
-gcloud = "0.12.0"
-google-apitools = "0.4.11"
-httplib2 = "0.9.2"
-IPy = "0.83"
-MarkupSafe = "0.23"
-ndg-httpsclient = "0.4.0"
-Pillow = "4.1.1"
-python-dateutil = "2.5.3"
-rauth = "0.7.3"
-raven = {version = "=6.3.0",extras = ["flask"]}
-redis = "2.10.5"
-shortcodes = "2.5.0"
-WebOb = "1.5.0"
-wheel = "0.29.0"
-zencoder = "0.6.5"
-pillarsdk = {path = "../pillar-python-sdk"}
+attrs = "~19"
+algoliasearch = "~1"
+bcrypt = "~3"
+blinker = "~1.4"
+bleach = "~3.1"
+celery = {version = "~4.3",extras = ["redis"]}
+commonmark = "~0.9"
 
-# Version pins for secondary requirements
-kombu = "~4.2"
+# These must match the version of ElasticSearch used:
+elasticsearch = "~6.1"
+elasticsearch-dsl = "~6.1"
+
+Eve = "~0.8"  # currently latest is 0.9
+Flask = "~1.0"
+Flask-Babel = "~0.12"
+Flask-Caching = "~1.7"
+Flask-DebugToolbar = "~0.10"
+Flask-Script = "~2.0"
+Flask-Login = "~0.4"
+Flask-WTF = "~0.14"
+gcloud = "~0.18"
+google-apitools = "~0.5"
+IPy = "~1.00"
+MarkupSafe = "~1.1"
+ndg-httpsclient = "~0.5"
+Pillow = "~6.0"
+python-dateutil = "~2.8"
+rauth = "~0.7"
+raven = {version = "~6.10",extras = ["flask"]}
+redis = "~3.2"
+shortcodes = "~2.5"
+zencoder = "~0.6"
+pillarsdk = {path = "../pillar-python-sdk"}
 
 # Secondary requirements that weren't installed automatically:
 idna = "~2.8"