add tokio (0.2) as dependency to further async-ify our FromData code

i'm using this opportunity to also update reqwest (0.10), but it's
turning out to be a little trickier, as it requires more modern async
setup, and that appears to need a lot of thinking…

plume-models/Cargo.toml

@@ -16,7 +16,7 @@ lazy_static = "1.0"
 migrations_internals= "1.4.0"
 openssl = "0.10.22"
 rocket = { git = "https://github.com/SergioBenitez/Rocket", rev = "async" }
-reqwest = "0.9"
+reqwest = "0.10"
 scheduled-thread-pool = "0.2.2"
 serde = "1.0"
 serde_derive = "1.0"
@@ -24,9 +24,9 @@ serde_json = "1.0"
 tantivy = "0.10.1"
 url = "2.1"
 walkdir = "2.2"
-webfinger = "0.4.1"
+webfinger = "0.5"
 whatlang = "0.7.1"
-shrinkwraprs = "0.2.1"
+shrinkwraprs = "0.3"
 diesel-derive-newtype = "0.1.2"
 glob = "0.3.0"
 
@@ -54,7 +54,7 @@ default-features = false
 features = ["rocket"]
 
 [dev-dependencies]
-diesel_migrations = "1.3.0"
+diesel_migrations = "1.4.0"
 
 [features]
 postgres = ["diesel/postgres", "plume-macro/postgres" ]