Allow composer to install package on PHP 5.4 and above

Remove composer.lock file

Fixup travis config and version requirements to match

.travis.yml

@@ -4,6 +4,8 @@ php:
   - 7.1
   - 7.0
   - 5.6
+  - 5.5
+  - 5.4
 before_script: composer -n --prefer-source install --dev
 script: vendor/bin/phpunit
 after_script: php vendor/bin/coveralls

README.md

@@ -78,10 +78,7 @@ serialization.
 
 ## Requirements ##
 
-The package.json file has the requirement for PHP >=5.6, however the code very
-well may work in for PHP >=5.4, I just can't easily get the CI tools to work
-for PHP 5.4 through 7.1 so I just left it at the currently supported version
-of PHP.
+This project requires PHP 5.4 or newer.
 
 ## License ##
 

composer.json

@@ -1,6 +1,5 @@
 {
     "name": "pleonasm/bloom-filter",
-    "version": "1.0.0",
     "description": "A pure PHP implementation of a Bloom Filter",
     "keywords": ["bloom filter", "sets", "bloom", "filter"],
     "license": "BSD-2-Clause",
@@ -15,15 +14,11 @@
         "issues": "https://github.com/pleonasm/bloom-filter/issues"
     },
     "require": {
-        "php": ">=5.6.0"
+        "php": ">=5.4"
     },
     "require-dev": {
-        "phpunit/phpunit": "^5.7",
-        "phpunit/php-invoker": "^1.1",
-        "doctrine/instantiator": ">=1.0.5 <=1.0.99",
-        "phpdocumentor/reflection-docblock": ">=2.0.5 <=2.99.99",
-        "phpunit/php-token-stream": ">=1.4.11 <2.0.0",
-        "satooshi/php-coveralls": "dev-master@dev"
+        "phpunit/phpunit": "^4.8 || ^5.7 || ^6.4",
+        "satooshi/php-coveralls": "^1.0.1"
     },
     "autoload": {
         "psr-4": { "Pleo\\BloomFilter\\": "src/" }