chore: revert to 2018 edition (#847)

Fixes https://github.com/hyperium/tonic/issues/843

tests/ambiguous_methods/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 authors = ["Yonathan Randolph <[email protected]>"]
-edition = "2021"
+edition = "2018"
 license = "MIT"
 name = "ambiguous_methods"
 publish = false

tests/compression/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 authors = ["Lucio Franco <[email protected]>"]
-edition = "2021"
+edition = "2018"
 license = "MIT"
 name = "compression"
 publish = false

tests/extern_path/my_application/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 authors = ["Danny Hua <[email protected]>"]
-edition = "2021"
+edition = "2018"
 license = "MIT"
 name = "my_application"
 publish = false

tests/extern_path/uuid/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 authors = ["Danny Hua <[email protected]>"]
-edition = "2021"
+edition = "2018"
 license = "MIT"
 name = "uuid1"
 publish = false

tests/included_service/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 authors = ["Lucio Franco <[email protected]>"]
-edition = "2021"
+edition = "2018"
 license = "MIT"
 name = "included_service"
 publish = false

tests/integration_tests/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 authors = ["Lucio Franco <[email protected]>"]
-edition = "2021"
+edition = "2018"
 license = "MIT"
 name = "integration-tests"
 publish = false

tests/root-crate-path/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 authors = ["Lucio Franco <[email protected]>"]
-edition = "2021"
+edition = "2018"
 license = "MIT"
 name = "root-crate-path"
 publish = false

tests/same_name/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 authors = ["Lucio Franco <[email protected]>"]
-edition = "2021"
+edition = "2018"
 license = "MIT"
 name = "same_name"
 publish = false

tests/service_named_service/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 authors = ["Lucio Franco <[email protected]>"]
-edition = "2021"
+edition = "2018"
 license = "MIT"
 name = "service_named_service"
 publish = false

tests/stream_conflict/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 authors = ["Ben Sully <[email protected]>"]
-edition = "2021"
+edition = "2018"
 name = "stream_conflict"
 publish = false
 version = "0.1.0"

tests/wellknown-compiled/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 authors = ["Lucio Franco <[email protected]>"]
-edition = "2021"
+edition = "2018"
 license = "MIT"
 name = "wellknown-compiled"
 publish = false

tests/wellknown/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 authors = ["Lucio Franco <[email protected]>"]
-edition = "2021"
+edition = "2018"
 license = "MIT"
 name = "wellknown"
 publish = false