Modify examples to point to current repo

Instead of pointing to the current minor version, the examples'
`Cargo.toml`s should be a relative path to the current cloned repo. This
improves the examples by:

1. always being up-to-date if major or minor version updates occur;
2. being more up-to-standard with the examples' readme;
3. making debugging the library locally easier (not having to constantly
modify the version to a path).

examples/01_basic_ping_bot/Cargo.toml

@@ -4,4 +4,4 @@ version = "0.1.0"
 authors = ["my name <my@email.address>"]
 
 [dependencies.serenity]
-version = "0.1"
+path = "../../"

examples/02_transparent_guild_sharding/Cargo.toml

@@ -4,4 +4,4 @@ version = "0.1.0"
 authors = ["my name <my@email.address>"]
 
 [dependencies.serenity]
-version = "0.1"
+path = "../../"

examples/03_struct_utilities/Cargo.toml

@@ -5,4 +5,4 @@ authors = ["my name <my@email.address>"]
 
 [dependencies.serenity]
 features = ["methods"]
-version = "0.1"
+path = "../../"

examples/04_message_builder/Cargo.toml

@@ -4,4 +4,4 @@ version = "0.1.0"
 authors = ["my name <my@email.address>"]
 
 [dependencies.serenity]
-version = "0.1"
+path = "../../"

examples/05_user_login/Cargo.toml

@@ -4,4 +4,4 @@ version = "0.1.0"
 authors = ["my name <my@email.address>"]
 
 [dependencies.serenity]
-version = "0.1"
+path = "../../"

examples/06_command_framework/Cargo.toml

@@ -8,4 +8,4 @@ typemap = "0.3"
 
 [dependencies.serenity]
 features = ["framework", "methods"]
-version = "0.1"
+path = "../../"

examples/07_voice/Cargo.toml

@@ -5,4 +5,4 @@ authors = ["my name <my@email.address>"]
 
 [dependencies.serenity]
 features = ["cache", "framework", "methods", "voice"]
-version = "0.1"
+path = "../../"