Bump version to v0.2.0-alpha.1

For some reason the `binary_trees_parallel` fails to compile
but the `binary_trees` example suceeds :?

Regardless, the basic API is in place and I need to make a release
so that downstream code can use the new lifetimes 😉

Author: Techcable

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "zerogc"
-version = "0.1.3"
+version = "0.2.0-alpha.1"
 authors = ["Techcable <Techcable@techcable.net>"]
 description = "Zero overhead tracing garbage collection for rust"
 repository = "https://github.com/DuckLogic/zerogc"

libs/context/Cargo.toml

@@ -1,15 +1,15 @@
 [package]
 name = "zerogc-context"
 description = "Handles the context of a zerogc collector."
-version = "0.1.3"
+version = "0.2.0-alpha.1"
 authors = ["Techcable <Techcable@techcable.net>"]
 repository = "https://github.com/DuckLogic/zerogc"
 readme = "../../README.md"
 license = "MIT"
 edition = "2018"
 
 [dependencies]
-zerogc = { path = "../..", version = "0.1.3" }
+zerogc = { path = "../..", version = "0.2.0-alpha.1" }
 once_cell = { version = "1.5", optional = true }
 # Concurrency
 parking_lot = { version = "0.11", features = ["nightly"], optional = true }

libs/derive/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "zerogc-derive"
 description = "Procedural derive for zerogc's garbage collection"
-version = "0.1.4"
+version = "0.2.0-alpha.1"
 authors = ["Techcable <Techcable@techcable.net>"]
 repository = "https://github.com/DuckLogic/zerogc"
 readme = "../../README.md"
@@ -12,7 +12,7 @@ edition = "2018"
 proc-macro = true
 
 [dev-dependencies]
-zerogc = { version = "0.1.3", path = "../.." }
+zerogc = { version = "0.2.0-alpha.1", path = "../.." }
 
 [dependencies]
 # Proc macros

libs/simple/Cargo.toml

@@ -1,18 +1,18 @@
 [package]
 name = "zerogc-simple"
 description = "Lightweight mark/sweep collector for zerogc."
-version = "0.1.3"
+version = "0.2.0-alpha.1"
 authors = ["Techcable <Techcable@techcable.net>"]
 repository = "https://github.com/DuckLogic/zerogc"
 readme = "../../README.md"
 license = "MIT"
 edition = "2018"
 
 [dependencies]
-zerogc = { path = "../..", version = "0.1.3" }
+zerogc = { path = "../..", version = "0.2.0-alpha.1" }
 once_cell = { version = "1.5", optional = true }
 # Shared impl
-zerogc-context = { path = "../context", version = "0.1.3", default-features = false }
+zerogc-context = { path = "../context", version = "0.2.0-alpha.1", default-features = false }
 # Concurrency
 parking_lot = { version = "0.11", features = ["nightly"], optional = true }
 # Logging