Removes dotenv dep from leo-lang

Cargo.lock

@@ -630,12 +630,6 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
-[[package]]
-name = "dotenv"
-version = "0.15.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "77c90badedccf4105eca100756a0b1289e191f6fcbdadd3cee1d2f614f97da8f"
-
 [[package]]
 name = "either"
 version = "1.6.1"
@@ -1387,7 +1381,6 @@ dependencies = [
  "colored",
  "console",
  "dirs",
- "dotenv",
  "env_logger 0.8.2",
  "from-pest",
  "lazy_static",

Cargo.toml

@@ -103,9 +103,6 @@ version = "3.0.1"
 [dependencies.console]
 version = "0.13.0"
 
-[dependencies.dotenv]
-version = "0.15.0"
-
 [dependencies.env_logger]
 version = "0.8"