Remove AppVeyor now that Travis does Windows

[skip ci]

Cargo.toml

@@ -16,7 +16,6 @@ categories = ["email", "network-programming"]
 
 [badges]
 travis-ci = { repository = "jonhoo/rust-imap" }
-appveyor = { repository = "jonhoo/rust-imap", branch = "master", service = "github" }
 codecov = { repository = "jonhoo/rust-imap", branch = "master", service = "github" }
 maintenance = { status = "actively-developed" }
 is-it-maintained-issue-resolution = { repository = "jonhoo/rust-imap" }

README.md

@@ -7,7 +7,6 @@
 [![Documentation](https://docs.rs/imap/badge.svg)](https://docs.rs/imap/)
 [![Crate License](https://img.shields.io/crates/l/imap.svg)](https://crates.io/crates/imap)
 [![Build Status](https://travis-ci.org/jonhoo/rust-imap.svg)](https://travis-ci.org/jonhoo/rust-imap)
-[![Build Status](https://ci.appveyor.com/api/projects/status/github/jonhoo/rust-imap?svg=true)](https://ci.appveyor.com/api/projects/status/github/jonhoo/rust-imap)
 [![Coverage Status](https://codecov.io/gh/jonhoo/rust-imap/branch/master/graph/badge.svg)](https://codecov.io/gh/jonhoo/rust-imap)
 
 This crate lets you connect to and interact with servers that implement the IMAP protocol ([RFC

README.tpl

@@ -7,7 +7,6 @@
 [![Documentation](https://docs.rs/imap/badge.svg)](https://docs.rs/imap/)
 [![Crate License](https://img.shields.io/crates/l/imap.svg)](https://crates.io/crates/imap)
 [![Build Status](https://travis-ci.org/jonhoo/rust-imap.svg)](https://travis-ci.org/jonhoo/rust-imap)
-[![Build Status](https://ci.appveyor.com/api/projects/status/github/jonhoo/rust-imap?svg=true)](https://ci.appveyor.com/api/projects/status/github/jonhoo/rust-imap)
 [![Coverage Status](https://codecov.io/gh/jonhoo/rust-imap/branch/master/graph/badge.svg)](https://codecov.io/gh/jonhoo/rust-imap)
 
 {{readme}}

appveyor.yml

@@ -1,71 +0,0 @@
-# inspired by https://github.com/starkat99/appveyor-rust/blob/master/appveyor.yml
-
-environment:
-  matrix:
-
-### MSVC Toolchains ###
-
-  # Stable 64-bit MSVC
-    - channel: stable
-      target: x86_64-pc-windows-msvc
-  # Stable 32-bit MSVC
-    - channel: stable
-      target: i686-pc-windows-msvc
-  # Beta 64-bit MSVC
-    - channel: beta
-      target: x86_64-pc-windows-msvc
-  # Beta 32-bit MSVC
-    - channel: beta
-      target: i686-pc-windows-msvc
-
-### GNU Toolchains ###
-
-  # Stable 64-bit GNU
-    - channel: stable
-      target: x86_64-pc-windows-gnu
-  # Stable 32-bit GNU
-    - channel: stable
-      target: i686-pc-windows-gnu
-  # Beta 64-bit GNU
-    - channel: beta
-      target: x86_64-pc-windows-gnu
-  # Beta 32-bit GNU
-    - channel: beta
-      target: i686-pc-windows-gnu
-
-### MinGW Toolchains ###
-
-  # Stable 64-bit MinGW
-    - channel: stable
-      target: x86_64-pc-windows-msvc
-      MSYS_BITS: 64
-  # Stable 32-bit MinGW
-    - channel: stable
-      target: i686-pc-windows-msvc
-      MSYS_BITS: 32
-  # Beta 64-bit MinGW
-    - channel: beta
-      target: x86_64-pc-windows-msvc
-      MSYS_BITS: 64
-  # Beta 32-bit MinGW
-    - channel: beta
-      target: i686-pc-windows-msvc
-      MSYS_BITS: 32
-
-install:
-  # install Rust
-  - appveyor DownloadFile https://win.rustup.rs/ -FileName rustup-init.exe
-  - rustup-init -yv --default-toolchain %channel% --default-host %target%
-  - set PATH=%PATH%;%USERPROFILE%\.cargo\bin
-  - rustc -vV
-  - cargo -vV
-
-# Building is done in the test phase, so we disable Appveyor's build phase.
-build: false
-
-test_script:
-  - cargo check --all-targets
-  - cargo test --lib
-  - cargo test --doc
-  - cargo test --examples
-# note that we are not running integration tests!