remove iswritable assertions

Author: justincy

src/VCR/Storage/Json.php

@@ -17,8 +17,6 @@ class Json extends AbstractStorage
  */
  public function storeRecording(array $recording)
  {
- Assertion::writeable($this->filePath, "Specified path '{$this->filePath}' must be writeable.");
-
  fseek($this->handle, -1, SEEK_END);
  if (ftell($this->handle) > 2) {
  fwrite($this->handle, ',');

src/VCR/Storage/Yaml.php

@@ -45,8 +45,6 @@ public function __construct($cassettePath, $cassetteName, Parser $parser = null,
  */
  public function storeRecording(array $recording)
  {
- Assertion::writeable($this->filePath, "Specified path '{$this->filePath}' must be writeable.");
-
  fseek($this->handle, -1, SEEK_END);
  fwrite($this->handle, "\n" . $this->yamlDumper->dump(array($recording), 4));
  fflush($this->handle);