Add migration guide for 0.1.x → 0.2.x

.gitignore

@@ -1,3 +1,4 @@
+/build/
 /data/
 /vendor/
 /composer.lock

README.md

@@ -12,10 +12,51 @@ The client has been updated on Mar 12th in a non-backwards compatible manner. Pl
 
 ## Installation
 
+** Requirements
+
+* PHP 5.5+
+
 ```
 git clone https://github.com/kelunik/acme-client
 cd acme-client
-composer install
+composer install --no-dev
+```
+
+## Migration from 0.1.x to 0.2.x
+
+```
+# in ./data
+
+# Move your account key to new location:
+
+mkdir accounts
+mv account/key.pem accounts/acme-v01.api.letsencrypt.org.directory.pem
+# or accounts/acme-staging.api.letsencrypt.org.directory.pem if it's a staging key
+
+# account should now be empty or contain just a config.json, you can delete the folder then
+rm -rf account
+
+# Migrate certificates to new location:
+
+cd certs
+mkdir acme-v01.api.letsencrypt.org.directory
+
+# Move all your certificate directories
+# Repeat for all directories!
+mv example.com acme-v01.api.letsencrypt.org.directory
+# or acme-staging.api.letsencrypt.org.directory
+
+# Delete all config.json files which may exist
+find -name "config.json" | xargs rm
+
+# Update to current version
+git checkout master && git pull
+
+# Check out latest release
+git checkout $(git describe --tags `git rev-list --tags --max-count=1`)
+
+# Update dependencies
+composer update --no-dev
 ```
 
 ## Usage

composer.json

@@ -13,7 +13,6 @@
     "require": {
         "amphp/process": "^0.1.1",
         "bramus/monolog-colored-line-formatter": "^2",
-        "ext-posix": "*",
         "ext-openssl": "*",
         "kelunik/acme": "^0.3",
         "kelunik/certificate": "^1",
@@ -42,6 +41,16 @@
         ]
     },
     "require-dev": {
-        "phpunit/phpunit": "^5"
+        "phpunit/phpunit": "^5",
+        "macfja/phar-builder": "dev-master"
+    },
+    "extra": {
+        "phar-builder": {
+            "compression": "GZip",
+            "name": "acme.phar",
+            "output-dir": "build",
+            "include": ["bin", "src", "vendor"],
+            "entry-point": "bin/acme"
+        }
     }
 }