v0.1.0: Raise minimum php version, change some AST representations

Raise the minimum php version from 7.0 to 7.2.
Depend on phpunit 8 for local development

Unify method names for Node and Token to getFullStartPosition and getStartPosition
(Consistently end public API methods with Position).
Avoid the need for callers to check if an object is a Node/Token before
calling a method.

Convert UnsetIntrinsicExpression to UnsetStatement - it can only be used
as a statement.

Unify previously split up lists into a single list in some AST node
properties (initially done that way for backward compatibility)

Clean up unnecessary special case for throw
- This continues to be parsed as an ExpressionStatement with the same
  precedence

Rename throwStatement to throwExpression in test file names.

Author: TysonAndre

.travis.yml

@@ -1,13 +1,10 @@
 language: php
 
 php:
-  - 7.0
-  - 7.1
-  - 7.2
-  - 7.3
-  - 7.4
-  # Should be changed to 8.0 once travis officially provides that label.
-  - nightly
+  - '7.2'
+  - '7.3'
+  - '7.4'
+  - '8.0'
 
 env:
   - VALIDATION=false
@@ -30,12 +27,7 @@ cache:
 
 before_script:
   - if [[ $STATIC_ANALYSIS = true ]]; then composer require phpstan/phpstan --no-update; fi
-  - |
-    if php -r 'exit(PHP_MAJOR_VERSION < 8 ? 0 : 1);';
-      then composer install
-    else
-      composer install --ignore-platform-reqs
-    fi
+  - composer install
   - set -e # Stop on first error.
   - phpenv config-rm xdebug.ini || true
   - if find . -name "*.php" -path "./src/*" -path "./experiments/*" -path "./tools/*" -path "./syntax-visualizer/server/src/*" -exec php -l {} 2>&1 \; | grep "syntax error, unexpected"; then exit 1; fi

composer.json

@@ -6,7 +6,7 @@
         "php": ">=7.2"
     },
     "require-dev": {
-        "phpunit/phpunit": "^7.5.20"
+        "phpunit/phpunit": "^8.5.15"
     },
     "license": "MIT",
     "authors": [