Remove stray dep

Author: penelopeysm

Project.toml

@@ -8,7 +8,6 @@ version = "0.12.0"
 [deps]
 AbstractMCMC = "80f14c24-f653-4e6a-9b94-39d6b0f70001"
 Accessors = "7d9f7c33-5ae7-4f3b-8dc6-eff91059b697"
-BangBang = "198e06fe-97b7-11e9-32a5-e1d131e6ad66"
 DensityInterface = "b429d917-457f-4dbc-8f4c-0cc954292b1d"
 JSON = "682c06a0-de6a-54ab-a142-c8b1cf79cde6"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
@@ -23,7 +22,6 @@ AbstractPPLDistributionsExt = ["Distributions"]
 [compat]
 AbstractMCMC = "2, 3, 4, 5"
 Accessors = "0.1"
-BangBang = "0.4.4"
 DensityInterface = "0.4"
 Distributions = "0.25"
 JSON = "0.19 - 0.21"