Update README.md (#64)

README.md

@@ -51,7 +51,7 @@ Option                      | Required | Description
 `--binary-sha512-checksum`  | No       | The SHA512 checksum of the binary specified by `--binary-name`. Should be exactly 128 characters..
 `--module-param`            | No       | A key-value pair of the format `key=value` you wish to pass to the module as a parameter. May be used multiple times. <br>Note: a `--` will automatically be appended to the `key` when your module is invoked<br>See the documentation for each module to find out what parameters it accepts.
 `--download-dir`            | No       | The directory to which the module will be downloaded and from which it will be installed.
-`--binary-install-dir`      | No       | The directory to which the binary will be installed. Only applies to binaries (not modules). Default: $DEFAULT_BIN_DIR"
+`--binary-install-dir`      | No       | The directory to which the binary will be installed. Only applies to binaries (not modules). Default: DEFAULT_BIN_DIR.
 `--no-sudo`                 | No       | When true, don't use sudo to install the binary into the install directory. Only applies to binaries (not modules). Default: false.
 `--branch`                  | No       | Download the latest commit from this branch in --repo. This is an alternative to --tag,<br>and is used only for testing. This value is exposed to module install scripts as GRUNTWORK_INSTALL_BRANCH.
 `--ref`                     | No       | Download the latest commit from this ref in --repo. This is an alternative to --tag,<br>and is used only for testing. This value is exposed to module install scripts as GRUNTWORK_INSTALL_BRANCH.