Update to latest dotenv

Author: jtgeibel

Cargo.lock

@@ -44,7 +44,7 @@ env_logger = "0.5"
 hex = "0.3"
 htmlescape = "0.3.1"
 license-exprs = "^1.4"
-dotenv = "0.11.0"
+dotenv = "0.15"
 toml = "0.4"
 diesel = { version = "1.4.0", features = ["postgres", "serde_json", "chrono", "r2d2"] }
 diesel_full_text_search = "1.0.0"
@@ -93,6 +93,6 @@ tokio-core = "0.1"
 diesel_migrations = { version = "1.3.0", features = ["postgres"] }
 
 [build-dependencies]
-dotenv = "0.11"
+dotenv = "0.15"
 diesel = { version = "1.3.0", features = ["postgres"] }
 diesel_migrations = { version = "1.3.0", features = ["postgres"] }